CVE-2026-33993

{"id": "CVE-2026-33993", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33993", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-30T15:45:05.433846Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "locutusjs", "product": "locutus", "versions": [{"status": "affected", "version": "< 3.0.25"}]}]}], "published": "2026-03-27T23:17:14.237", "references": [{"url": "https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/locutusjs/locutus/pull/597", "tags": ["Issue Tracking"], "source": "security-advisories@github.com"}, {"url": "https://github.com/locutusjs/locutus/releases/tag/v3.0.25", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-1321"}]}], "descriptions": [{"lang": "en", "value": "Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the `unserialize()` function in `locutus/php/var/unserialize` assigns deserialized keys to plain objects via bracket notation without filtering the `__proto__` key. When a PHP serialized payload contains `__proto__` as an array or object key, JavaScript's `__proto__` setter is invoked, replacing the deserialized object's prototype with attacker-controlled content. This enables property injection, for...in propagation of injected properties, and denial of service via built-in method override. This is distinct from the previously reported prototype pollution in `parse_str` (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) \u2014 `unserialize` is a different function with no mitigation applied. Version 3.0.25 patches the issue."}, {"lang": "es", "value": "Locutus trae las bibliotecas est\u00e1ndar de otros lenguajes de programaci\u00f3n a JavaScript con fines educativos. Antes de la versi\u00f3n 3.0.25, la funci\u00f3n \u2019unserialize()\u2019 en \u2019locutus/php/var/unserialize\u2019 asigna claves deserializadas a objetos planos mediante notaci\u00f3n de corchetes sin filtrar la clave \u2019__proto__\u2019. Cuando una carga \u00fatil serializada de PHP contiene \u2019__proto__\u2019 como clave de array u objeto, se invoca el \u2019setter\u2019 de \u2019__proto__\u2019 de JavaScript, reemplazando el prototipo del objeto deserializado con contenido controlado por el atacante. Esto permite la inyecci\u00f3n de propiedades, la propagaci\u00f3n \u2019for...in\u2019 de propiedades inyectadas y la denegaci\u00f3n de servicio mediante la anulaci\u00f3n de m\u00e9todos incorporados. Esto es distinto de la contaminaci\u00f3n de prototipos previamente reportada en \u2019parse_str\u2019 (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) - \u2019unserialize\u2019 es una funci\u00f3n diferente sin mitigaci\u00f3n aplicada. La versi\u00f3n 3.0.25 corrige el problema."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:locutus:locutus:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "0F339EAA-6928-4474-AEC9-654C3C19966D", "versionEndExcluding": "3.0.25"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}