{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-39363",
        "ASSIGNER": "security-advisories@github.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-863: Incorrect Authorization",
                        "cweId": "CWE-863"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "vyperlang",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "vyper",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "= 0.2.15"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "= 0.2.16"
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "= 0.3.0"
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-5824-cm3x-3c38",
                "refsource": "MISC",
                "name": "https://github.com/vyperlang/vyper/security/advisories/GHSA-5824-cm3x-3c38"
            },
            {
                "url": "https://github.com/vyperlang/vyper/pull/2439",
                "refsource": "MISC",
                "name": "https://github.com/vyperlang/vyper/pull/2439"
            },
            {
                "url": "https://github.com/vyperlang/vyper/pull/2514",
                "refsource": "MISC",
                "name": "https://github.com/vyperlang/vyper/pull/2514"
            },
            {
                "url": "https://hackmd.io/@LlamaRisk/BJzSKHNjn",
                "refsource": "MISC",
                "name": "https://hackmd.io/@LlamaRisk/BJzSKHNjn"
            },
            {
                "url": "https://hackmd.io/@vyperlang/HJUgNMhs2",
                "refsource": "MISC",
                "name": "https://hackmd.io/@vyperlang/HJUgNMhs2"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-5824-cm3x-3c38",
        "discovery": "UNKNOWN"
    },
    "impact": {
        "cvss": [
            {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
            }
        ]
    }
}