{
  "id": "CVE-2023-39363",
  "sourceIdentifier": "security-advisories@github.com",
  "published": "2023-08-07T19:15:11.873",
  "lastModified": "2023-09-18T21:15:55.163",
  "vulnStatus": "Modified",
  "descriptions": [
    {
      "lang": "en",
      "value": "Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). In versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically: a `.vy` contract compiled with `vyper` versions `0.2.15`, `0.2.16`, or `0.3.0`; a primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates); and a secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function. Version 0.3.1 contains a fix for this issue."
    }
  ],
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          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
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          "baseScore": 5.9,
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      "description": [
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  "references": [
    {
      "url": "https://github.com/vyperlang/vyper/pull/2439",
      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/vyperlang/vyper/pull/2514",
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