CVE-2025-47774

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{"affected": [{"affectedData": [{"product": "vyper", "vendor": "vyperlang", "versions": [{"status": "affected", "version": "<= 0.4.2rc1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Vyper is the Pythonic Programming Language for the Ethereum Virtual Machine. In versions up to and including 0.4.2rc1, the `slice()` builtin can elide side effects when the output length is 0, and the source bytestring is a builtin (`msg.data` or `<address>.code`). The reason is that for these source locations, the check that `length >= 1` is skipped. The result is that a 0-length bytestring constructed with slice can be passed to `make_byte_array_copier`, which elides evaluation of its source argument when the max length is 0. The impact is that side effects in the `start` argument may be elided when the `length` argument is 0, e.g. `slice(msg.data, self.do_side_effect(), 0)`. The fix in pull request 4645 disallows any invocation of `slice()` with length 0, including for the ad hoc locations discussed in this advisory. The fix is expected to be part of version 0.4.2."}, {"lang": "es", "value": "Vyper es el lenguaje de programaci\u00f3n Pythonic para la M\u00e1quina Virtual de Ethereum. En versiones hasta la 0.4.2rc1 (incluida), la instrucci\u00f3n integrada `slice()` puede omitir efectos secundarios cuando la longitud de salida es 0 y la cadena de bytes de origen es una instrucci\u00f3n integrada (`msg.data` o `.code`). Esto se debe a que, para estas ubicaciones de origen, se omite la comprobaci\u00f3n de que `length &gt;= 1`. Como resultado, una cadena de bytes de longitud 0 construida con slice puede pasarse a `make_byte_array_copier`, que omite la evaluaci\u00f3n de su argumento de origen cuando la longitud m\u00e1xima es 0. Esto implica que los efectos secundarios del argumento `start` pueden omitirse cuando el argumento `length` es 0, por ejemplo, `slice(msg.data, self.do_side_effect(), 0)`. La correcci\u00f3n en la solicitud de incorporaci\u00f3n de cambios 4645 impide la invocaci\u00f3n de `slice()` con longitud 0, incluso para las ubicaciones ad hoc descritas en este aviso. Se espera que la soluci\u00f3n sea parte de la versi\u00f3n 0.4.2."}], "id": "CVE-2025-47774", "lastModified": "2026-06-17T09:28:40.037", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.9, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-47774", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-05-15T18:33:24.817738Z", "version": "2.0.3"}}]}, "published": "2025-05-15T18:15:38.440", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/vyperlang/vyper/blob/68b68c4b30c5ef2f312b4674676170b8a6eaa316/vyper/builtins/functions.py#L315-L319"}, {"source": "security-advisories@github.com", "url": "https://github.com/vyperlang/vyper/blob/68b68c4b30c5ef2f312b4674676170b8a6eaa316/vyper/codegen/core.py#L189-L191"}, {"source": "security-advisories@github.com", "url": "https://github.com/vyperlang/vyper/pull/4645"}, {"source": "security-advisories@github.com", "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-3vcg-j39x-cwfm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-691"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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