CVE-2026-114118

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{"bugzilla": {"description": "vyper: Vyper: Deployment of empty smart contracts via integer underflow in create_from_blueprint", "id": "2558037", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558037"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-681", "details": ["Vyper 0.3.4 through 0.5.0b1 computes the remaining blueprint size in create_from_blueprint by uint256 subtraction without first checking that code_offset is below the blueprint's code size, so a huge offset wraps to a small positive value. An attacker controlling code_offset can make a factory deploy contracts with no runtime code, potentially trapping ETH and tokens.", "A flaw was found in Vyper. When deploying smart contracts from blueprints (reusable contract templates), the create_from_blueprint function calculates remaining code size without verifying that the offset is within the template boundaries, causing an integer calculation error. A remote attacker controlling the offset parameter can exploit this vulnerability to deploy contracts without executable runtime code, potentially locking Ether (ETH) and tokens permanently."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-114118", "public_date": "2026-10-21T00:37:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-114118\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-114118\nhttps://github.com/vyperlang/vyper/security/advisories/GHSA-fxg7-4wqg-c8gh\nhttps://www.vulncheck.com/advisories/vyper-0.3.4-through-0.5-0b1-create-from-blueprint-offset-validation-bypass-via-unsigned-wraparound"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires specific conditions where external actors can supply arbitrary offset parameters during blueprint deployment, limiting the blast radius to vulnerable factory patterns. Vyper is not distributed with Red Hat Enterprise Linux or other supported Red Hat software, meaning default enterprise deployments do not expose this functionality.", "threat_severity": "Moderate"}

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