Analysis Run

{"no_findings":false,"summary":"Bytecode analysis indicates a fallback-only ETH forwarder with no storage, no delegatecall, and no proxy/upgradability surface. The main meaningful risk is that its only external ETH transfer is stipend-based and its success value is ignored, so ETH can be silently stranded if the hardcoded recipient cannot accept the transfer.","findings":[{"severity":"medium","category":"other","title":"Unchecked hardcoded ETH sweep can silently trap funds","exploit_scenario":"Any call into the contract reaches the fallback and attempts to send the entire contract balance to the fixed address 0x0047a8033cc6d6ca2ed5044674fd421f44884de8 using CALL with zero supplied gas. Because CALL with nonzero value only provides stipend-level gas in this shape, a recipient contract that reverts or needs more than the stipend will cause the transfer to fail. The bytecode then discards the success flag and stops, so callers get no failure signal and there is no visible alternate withdrawal path in the runtime analyzed. This is conditional because bytecode alone cannot prove whether the recipient is an EOA or a payable contract.","recommendation":"Revert when the ETH transfer fails instead of discarding the CALL result. If the hardcoded recipient is intentional, verify it can always receive stipend-based ETH transfers; otherwise use an explicit withdrawal function with configurable recipient validation and deliberate gas/reentrancy handling.","evidence":"From BYTECODE_BUNDLE.json, the runtime is fallback-only and contains a single CALL at pc 0x44. Stack reconstruction of the sequence around pc 0x0b..0x44 shows CALL(gas=0,to=0x0047a8033cc6d6ca2ed5044674fd421f44884de8,value=BALANCE(address(this)),inOffset=0x60,inSize=0,outOffset=0x60,outSize=0). The success bit returned by CALL is immediately discarded by POP instructions at pc 0x45..0x49. No storage writes, auth guards, or alternate callable selectors were detected in the artifact.","locations":["selector:fallback","pc:0x44","pc:0x45"]}]}

OpenAI Codex v0.118.0 (research preview)
--------
workdir: /tmp/codex-0c4ilp4l
model: gpt-5.4
provider: openai
approval: never
sandbox: read-only
reasoning effort: high
reasoning summaries: none
session id: 019d5b69-880a-7cc2-a07c-7aebb9316ab9
--------
user
You are a security auditor. You ONLY have runtime bytecode + analysis artifacts.
You MUST read `BYTECODE_BUNDLE.json` before concluding; it contains the bytecode summary,
evidence bundle, callsites, storage slots, and detector findings.

Special cases when reasoning from bytecode (be explicit about uncertainty):
- Selector inference is best-effort; missing selectors are common.
- Fallback/receive paths may be the only entrypoints.
- CALL vs DELEGATECALL semantics differ; DELEGATECALL executes in caller storage.
- Proxy patterns (EIP-1967, minimal proxies, beacon) change which storage is authoritative.
- Storage slots are raw; mappings/arrays appear via keccak patterns, names are unknown.
- Guard detection is heuristic; absence of guards does NOT mean unguarded.
- Returndata checking is unknown unless explicitly shown in evidence.
- Precompiles (0x1..0x9) and common ERC20 transfer selectors may appear; do not over-claim.

Output MUST be valid JSON matching the provided schema.
- If you find nothing meaningful: set no_findings=true and findings=[].
- Otherwise: set no_findings=false and include findings with severity/category/title.
- Locations can be pc references like "pc:0x123" or selectors like "selector:0xa9059cbb".

Focus on: reentrancy, access control, upgradeability/proxy issues, signature validation,
accounting/invariant breaks, dangerous delegatecall, and untrusted external calls.
Be conservative: if evidence is weak, mark severity low/medium and explain why.
warning: Codex could not find system bubblewrap on PATH. Please install bubblewrap with your package manager. Codex will use the vendored bubblewrap in the meantime.
exec
/bin/bash -lc pwd in /tmp/codex-0c4ilp4l
 succeeded in 0ms:
/tmp/codex-0c4ilp4l

exec
/bin/bash -lc 'rg --files' in /tmp/codex-0c4ilp4l
 succeeded in 0ms:
BYTECODE_BUNDLE.json
codex-output-schema.json

exec
/bin/bash -lc "sed -n '1,260p' BYTECODE_BUNDLE.json" in /tmp/codex-0c4ilp4l
 succeeded in 0ms:
{
  "analysis_artifact": {
    "address": "0xb5eb68417e27752b4da0aaf835b7fb3d74b46371",
    "artifact_hash": "0x85400b79285f9a7104daa50a9022f6a776ff3fbe7398cc84f772d4072f357816",
    "artifact_json": {
      "auth": {
        "guards": []
      },
      "basic_blocks": [
        {
          "end_pc": 9,
          "hash": "0x56f6410e5dccbc7c45f37b206aed959b9d4b216feb25c960495aadcc94210055",
          "opcodes": [
            "PUSH1",
            "PUSH1",
            "MSTORE",
            "CALLDATASIZE",
            "ISZERO",
            "PUSH1",
            "JUMPI"
          ],
          "start_pc": 0
        },
        {
          "end_pc": 74,
          "hash": "0x29382bd2547440d7775f2c5d91dfc34f421f921d27afc7a1d80f7fb77f24ad46",
          "opcodes": [
            "JUMPDEST",
            "PUSH1",
            "PUSH19",
            "PUSH1",
            "ADDRESS",
            "PUSH20",
            "AND",
            "BALANCE",
            "PUSH1",
            "OP_82",
            "OP_81",
            "OP_81",
            "OP_81",
            "OP_85",
            "OP_88",
            "OP_83",
            "CALL",
            "POP",
            "POP",
            "POP",
            "POP",
            "POP",
            "JUMP"
          ],
          "start_pc": 10
        },
        {
          "end_pc": 76,
          "hash": "0xb924fbe00e003ea2d854c3093b6cd6cf4765953f7e4bbf2dad30fb6197566799",
          "opcodes": [
            "JUMPDEST",
            "STOP"
          ],
          "start_pc": 75
        }
      ],
      "callsites": [
        {
          "opcode": "CALL",
          "pc": 68,
          "returndata_checked": null,
          "target_expression_category": "computed",
          "value_expression_category": "computed"
        }
      ],
      "cfg_edges": [
        {
          "from": "bb:0",
          "to": "bb:10",
          "type": "control_flow"
        },
        {
          "from": "bb:0",
          "to": "bb:10",
          "type": "control_flow_fallthrough"
        }
      ],
      "cfg_hash": "0x9e9dc805105b36bb077b1962c434d933fbba80bf888f69eb62138808399e0d32",
      "dispatcher_type": "fallback_only",
      "function_entries": [
        {
          "entry_pc": 0,
          "selector": "fallback"
        }
      ],
      "functions": [
        {
          "auth": {
            "guards": []
          },
          "entry_pc": 0,
          "selector": "fallback",
          "sinks": {
            "call": 1,
            "delegatecall": 0,
            "selfdestruct": 0,
            "staticcall": 0
          },
          "storage": {
            "reads": 0,
            "slots": [],
            "writes": 0
          }
        }
      ],
      "selectors": [],
      "sinks": {
        "call": 1,
        "create": 0,
        "create2": 0,
        "delegatecall": 0,
        "selfdestruct": 0,
        "staticcall": 0,
        "upgrade_slot_write_suspected": false
      },
      "storage": {
        "keccak_count": 0,
        "reads": 0,
        "slots": [],
        "writes": 0
      },
      "version": "analysis_artifact_v1"
    },
    "block_number": null,
    "chain_id": 1,
    "codehash": "0x581c06cfb181b0cf5bd63d3ac5463664e9effa7d65eaaa5bd898aac3d0b99272",
    "created_at": "2026-04-04T19:47:11.000000Z",
    "id": 1767,
    "updated_at": "2026-04-04T19:47:11.000000Z",
    "version": "analysis_artifact_v1"
  },
  "analysis_run": {
    "address": "0xb5eb68417e27752b4da0aaf835b7fb3d74b46371",
    "block_number": null,
    "chain_id": 1,
    "child_links": [],
    "created_at": "2025-12-19T20:03:51.000000Z",
    "id": "019b3836-2695-700f-a0d0-7f5a831b9921",
    "parent_links": [],
    "status": "running",
    "updated_at": "2026-04-04T19:47:11.000000Z"
  },
  "artifact": {
    "codehash": "0x581c06cfb181b0cf5bd63d3ac5463664e9effa7d65eaaa5bd898aac3d0b99272",
    "compiler_json": {
      "etherscan": {
        "skipped": true
      }
    },
    "implementation_address": null,
    "is_proxy": false,
    "runtime_bytecode": {
      "full": "0x60606040523615600a575b604b7247a8033cc6d6ca2ed5044674fd421f44884de860003073ffffffffffffffffffffffffffffffffffffffff1631606082818181858883f15050505050565b00",
      "head": null,
      "length": 156,
      "tail": null,
      "truncated": false
    },
    "verified_source": false
  },
  "capability_graph": {
    "address": "0xb5eb68417e27752b4da0aaf835b7fb3d74b46371",
    "block_number": null,
    "chain_id": 1,
    "codehash": "0x581c06cfb181b0cf5bd63d3ac5463664e9effa7d65eaaa5bd898aac3d0b99272",
    "created_at": "2026-04-04T19:47:11.000000Z",
    "graph_hash": "0xed17671f7b61fe7e303b712623e139e67a39bb6d13850250eefc18fca615c574",
    "graph_json": {
      "edges": [
        {
          "from": "bb:0",
          "to": "bb:10",
          "type": "control_flow"
        },
        {
          "from": "bb:0",
          "to": "bb:10",
          "type": "control_flow_fallthrough"
        },
        {
          "from": "fn:fallback",
          "to": "bb:0",
          "type": "entry"
        },
        {
          "from": "bb:10",
          "to": "call:68",
          "type": "contains"
        },
        {
          "from": "call:68",
          "to": "sink:call",
          "type": "capability"
        }
      ],
      "nodes": [
        {
          "end_pc": 9,
          "hash": "0x56f6410e5dccbc7c45f37b206aed959b9d4b216feb25c960495aadcc94210055",
          "id": "bb:0",
          "start_pc": 0,
          "type": "basic_block"
        },
        {
          "end_pc": 74,
          "hash": "0x29382bd2547440d7775f2c5d91dfc34f421f921d27afc7a1d80f7fb77f24ad46",
          "id": "bb:10",
          "start_pc": 10,
          "type": "basic_block"
        },
        {
          "end_pc": 76,
          "hash": "0xb924fbe00e003ea2d854c3093b6cd6cf4765953f7e4bbf2dad30fb6197566799",
          "id": "bb:75",
          "start_pc": 75,
          "type": "basic_block"
        },
        {
          "id": "call:68",
          "opcode": "CALL",
          "pc": 68,
          "type": "callsite"
        },
        {
          "id": "sink:call",
          "type": "sink"
        },
        {
          "entry_pc": 0,
          "id": "fn:fallback",
          "selector": "fallback",
          "type": "function"
        }
      ],
      "version": "capability_graph_v1"
    },
    "id": 1767,
    "updated_at": "2026-04-04T19:47:11.000000Z",
    "version": "capability_graph_v1"
  },
  "detector_findings": [
    {
      "confidence": 60,
      "evidence_json": {
        "call_count": 1,
        "examples": [
          {
            "opcode": "CALL",
            "pc": 68,
            "returndata_checked": null,
            "target_expression_category": "computed",
            "value_expression_category": "computed"
          }

exec
/bin/bash -lc "sed -n '261,520p' BYTECODE_BUNDLE.json" in /tmp/codex-0c4ilp4l
 succeeded in 0ms:
        ],
        "guards_detected": [],
        "untrusted_call_count": 1
      },
      "normalized_json": {
        "sink": "CALL"
      },
      "severity": "high",
      "title": "Untrusted CALL target/value reachable",
      "validated": true,
      "validation_json": {
        "attempts": 1,
        "call_targets": [
          "0x0047a8033cc6d6ca2ed5044674fd421f44884de8",
          "0xb5eb68417e27752b4da0aaf835b7fb3d74b46371"
        ],
        "classification": "target_varies",
        "confirmed": true,
        "errors": 0,
        "matched_probe": null,
        "sink": "CALL",
        "status": "confirmed",
        "target_varies": true,
        "trace_id": "0xbe97999d3a2676905dfa4e9ef9cad1214fb2675ffa229f13e5fb8ff224a6ec6f",
        "trace_mode": "callTracer"
      }
    },
    {
      "confidence": 55,
      "evidence_json": {
        "eth_value_calls": 1,
        "examples": [
          {
            "opcode": "CALL",
            "pc": 68,
            "returndata_checked": null,
            "target_expression_category": "computed",
            "value_expression_category": "computed"
          }
        ],
        "guards_detected": []
      },
      "normalized_json": {
        "sink": "CALL",
        "value": "nonzero"
      },
      "severity": "high",
      "title": "ETH value transfer possible",
      "validated": true,
      "validation_json": {
        "attempts": 1,
        "call_targets": [
          "0x0047a8033cc6d6ca2ed5044674fd421f44884de8",
          "0xb5eb68417e27752b4da0aaf835b7fb3d74b46371"
        ],
        "classification": "target_varies",
        "confirmed": true,
        "errors": 0,
        "matched_probe": null,
        "sink": "CALL",
        "status": "confirmed",
        "target_varies": true,
        "trace_id": "0xbe97999d3a2676905dfa4e9ef9cad1214fb2675ffa229f13e5fb8ff224a6ec6f",
        "trace_mode": "callTracer"
      }
    }
  ],
  "heuristics_summary": {
    "create2_count": 0,
    "delegatecall_count": 0,
    "flags": [],
    "selfdestruct_count": 0
  }
}
  → Inspect BYTECODE_BUNDLE.json and reconstruct fallback control flow/call semantics
  • Assess whether the confirmed CALL implies exploitable issues or expected bytecode behavior
  • Produce JSON findings with explicit uncertainty and bytecode evidence
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 92ms:
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 3ms:
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 5ms:
  0 PUSH1 0x60
  2 PUSH1 0x40
  4 MSTORE
  5 CALLDATASIZE
  6 ISZERO
  7 PUSH1 0x0a
  9 JUMPI
 10 JUMPDEST
 11 PUSH1 0x4b
 13 PUSH19 0x47a8033cc6d6ca2ed5044674fd421f44884de8
 33 PUSH1 0x00
 35 ADDRESS
 36 PUSH20 0xffffffffffffffffffffffffffffffffffffffff
 57 AND
 58 BALANCE
 59 PUSH1 0x60
 61 DUP3
 62 DUP2
 63 DUP2
 64 DUP2
 65 DUP6
 66 DUP9
 67 DUP4
 68 CALL
 69 POP
 70 POP
 71 POP
 72 POP
 73 POP
 74 JUMP
 75 JUMPDEST
 76 STOP
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 8ms:
{
  gas: '0x00',
  to: '0x47a8033cc6d6ca2ed5044674fd421f44884de8',
  value: 'balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))',
  inOff: '0x60',
  inSize: '0x00',
  outOff: '0x60',
  outSize: '0x00',
  before: [
    '0x0a',
    '0x4b',
    '0x47a8033cc6d6ca2ed5044674fd421f44884de8',
    '0x00',
    'balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))',
    '0x60'
  ]
}
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 12ms:
JUMPI { dest: undefined, cond: undefined }
{
  gas: undefined,
  to: undefined,
  value: undefined,
  inOff: undefined,
  inSize: undefined,
  outOff: undefined,
  outSize: undefined,
  before: []
}
JUMP undefined
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 12ms:
MSTORE { offset: '0x40', val: '0x60' }
JUMPI { dest: '0x0a', cond: 'iszero(calldatasize)' }
CALL {
  gas: '0x00',
  to: '0x47a8033cc6d6ca2ed5044674fd421f44884de8',
  value: 'balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))',
  inOff: '0x60',
  inSize: '0x00',
  outOff: '0x60',
  outSize: '0x00',
  before: [
    '0x4b',
    '0x47a8033cc6d6ca2ed5044674fd421f44884de8',
    '0x00',
    'balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))',
    '0x60'
  ]
}
JUMP 0x4b
[]
exec
js_repl in /tmp/codex-0c4ilp4l
 succeeded in 2ms:
before CALL bottom->top
0:0x4b
1:0x47a8033cc6d6ca2ed5044674fd421f44884de8
2:0x00
3:balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))
4:0x60
5:0x00
6:0x60
7:0x00
8:0x60
9:balance((address(this)&0xffffffffffffffffffffffffffffffffffffffff))
10:0x47a8033cc6d6ca2ed5044674fd421f44884de8
11:0x00
exec
/bin/bash -lc 'cat codex-output-schema.json' in /tmp/codex-0c4ilp4l
 succeeded in 0ms:
{"type": "object", "additionalProperties": false, "required": ["no_findings", "summary", "findings"], "properties": {"no_findings": {"type": "boolean"}, "summary": {"type": "string"}, "findings": {"type": "array", "items": {"type": "object", "additionalProperties": false, "required": ["severity", "category", "title", "evidence", "locations", "exploit_scenario", "recommendation"], "properties": {"severity": {"type": "string", "enum": ["info", "low", "medium", "high", "critical"]}, "category": {"type": "string", "enum": ["access_control", "reentrancy", "math", "oracle", "upgradeability", "auth", "other"]}, "title": {"type": "string"}, "exploit_scenario": {"type": "string"}, "recommendation": {"type": "string"}, "evidence": {"type": "string"}, "locations": {"type": "array", "items": {"type": "string"}}}}}}}
  ✓ Inspect BYTECODE_BUNDLE.json and reconstruct fallback control flow/call semantics
  ✓ Assess whether the confirmed CALL implies exploitable issues or expected bytecode behavior
  → Produce JSON findings with explicit uncertainty and bytecode evidence
codex
{"no_findings":false,"summary":"Bytecode analysis indicates a fallback-only ETH forwarder with no storage, no delegatecall, and no proxy/upgradability surface. The main meaningful risk is that its only external ETH transfer is stipend-based and its success value is ignored, so ETH can be silently stranded if the hardcoded recipient cannot accept the transfer.","findings":[{"severity":"medium","category":"other","title":"Unchecked hardcoded ETH sweep can silently trap funds","exploit_scenario":"Any call into the contract reaches the fallback and attempts to send the entire contract balance to the fixed address 0x0047a8033cc6d6ca2ed5044674fd421f44884de8 using CALL with zero supplied gas. Because CALL with nonzero value only provides stipend-level gas in this shape, a recipient contract that reverts or needs more than the stipend will cause the transfer to fail. The bytecode then discards the success flag and stops, so callers get no failure signal and there is no visible alternate withdrawal path in the runtime analyzed. This is conditional because bytecode alone cannot prove whether the recipient is an EOA or a payable contract.","recommendation":"Revert when the ETH transfer fails instead of discarding the CALL result. If the hardcoded recipient is intentional, verify it can always receive stipend-based ETH transfers; otherwise use an explicit withdrawal function with configurable recipient validation and deliberate gas/reentrancy handling.","evidence":"From BYTECODE_BUNDLE.json, the runtime is fallback-only and contains a single CALL at pc 0x44. Stack reconstruction of the sequence around pc 0x0b..0x44 shows CALL(gas=0,to=0x0047a8033cc6d6ca2ed5044674fd421f44884de8,value=BALANCE(address(this)),inOffset=0x60,inSize=0,outOffset=0x60,outSize=0). The success bit returned by CALL is immediately discarded by POP instructions at pc 0x45..0x49. No storage writes, auth guards, or alternate callable selectors were detected in the artifact.","locations":["selector:fallback","pc:0x44","pc:0x45"]}]}
tokens used
36,001

{
    "codex": {
        "ran_at": "2026-04-05T02:14:23.863177+00:00",
        "returncode": 0
    },
    "project": {
        "mode": "bytecode",
        "bytecode_length": 156,
        "bytecode_truncated": false,
        "capability_graph_present": true,
        "analysis_artifact_present": true
    },
    "summary": "Bytecode analysis indicates a fallback-only ETH forwarder with no storage, no delegatecall, and no proxy/upgradability surface. The main meaningful risk is that its only external ETH transfer is stipend-based and its success value is ignored, so ETH can be silently stranded if the hardcoded recipient cannot accept the transfer.",
    "raw_final": {
        "summary": "Bytecode analysis indicates a fallback-only ETH forwarder with no storage, no delegatecall, and no proxy/upgradability surface. The main meaningful risk is that its only external ETH transfer is stipend-based and its success value is ignored, so ETH can be silently stranded if the hardcoded recipient cannot accept the transfer.",
        "findings": [
            {
                "title": "Unchecked hardcoded ETH sweep can silently trap funds",
                "category": "other",
                "evidence": "From BYTECODE_BUNDLE.json, the runtime is fallback-only and contains a single CALL at pc 0x44. Stack reconstruction of the sequence around pc 0x0b..0x44 shows CALL(gas=0,to=0x0047a8033cc6d6ca2ed5044674fd421f44884de8,value=BALANCE(address(this)),inOffset=0x60,inSize=0,outOffset=0x60,outSize=0). The success bit returned by CALL is immediately discarded by POP instructions at pc 0x45..0x49. No storage writes, auth guards, or alternate callable selectors were detected in the artifact.",
                "severity": "medium",
                "locations": [
                    "selector:fallback",
                    "pc:0x44",
                    "pc:0x45"
                ],
                "recommendation": "Revert when the ETH transfer fails instead of discarding the CALL result. If the hardcoded recipient is intentional, verify it can always receive stipend-based ETH transfers; otherwise use an explicit withdrawal function with configurable recipient validation and deliberate gas/reentrancy handling.",
                "exploit_scenario": "Any call into the contract reaches the fallback and attempts to send the entire contract balance to the fixed address 0x0047a8033cc6d6ca2ed5044674fd421f44884de8 using CALL with zero supplied gas. Because CALL with nonzero value only provides stipend-level gas in this shape, a recipient contract that reverts or needs more than the stipend will cause the transfer to fail. The bytecode then discards the success flag and stops, so callers get no failure signal and there is no visible alternate withdrawal path in the runtime analyzed. This is conditional because bytecode alone cannot prove whether the recipient is an EOA or a payable contract."
            }
        ],
        "no_findings": false
    },
    "no_findings": false,
    "schema_version": 1
}

00000000: PUSH1 0x60
00000002: PUSH1 0x40
00000004: MSTORE
00000005: CALLDATASIZE
00000006: ISZERO
00000007: PUSH1 0x0a
00000009: JUMPI
0000000a: JUMPDEST
0000000b: PUSH1 0x4b
0000000d: PUSH19 0x47a8033cc6d6ca2ed5044674fd421f44884de8
00000021: PUSH1 0x00
00000023: ADDRESS
00000024: PUSH20 0xffffffffffffffffffffffffffffffffffffffff
00000039: AND
0000003a: BALANCE
0000003b: PUSH1 0x60
0000003d: DUP3
0000003e: DUP2
0000003f: DUP2
00000040: DUP2
00000041: DUP6
00000042: DUP9
00000043: DUP4
00000044: CALL
00000045: POP
00000046: POP
00000047: POP
00000048: POP
00000049: POP
0000004a: JUMP
0000004b: JUMPDEST
0000004c: STOP

Warning: This is a nightly build of Foundry. It is recommended to use the latest stable version. To mute this warning set `FOUNDRY_DISABLE_NIGHTLY_WARNING` in your environment.