CVE-2026-55388

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{"affected": [{"affectedData": [{"product": "piscina", "vendor": "piscinajs", "versions": [{"status": "affected", "version": "< 4.9.3"}, {"status": "affected", "version": ">= 5.0.0-alpha.0, < 5.2.0"}, {"status": "affected", "version": ">= 6.0.0-rc.1, < 6.0.0-rc.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "piscina is a node.js worker pool implementation. Prior to 6.0.0-rc.2, 5.2.0, and 4.9.3, piscina's constructor and run() paths read the filename option via plain member access. Both reads fall through the prototype chain when the caller's options object doesn't have filename as an own property. When Object.prototype.filename is polluted upstream the inherited value flows to worker_threads.Worker import and the attacker's .mjs runs in the worker. This vulnerability is fixed in 6.0.0-rc.2, 5.2.0, and 4.9.3."}, {"lang": "es", "value": "piscina es una implementaci\u00f3n de pool de workers de node.js. Antes de 6.0.0-rc.2, 5.2.0 y 4.9.3, las rutas del constructor y de run() de piscina le\u00edan la opci\u00f3n filename a trav\u00e9s de acceso directo a miembros. Ambas lecturas ca\u00edan a trav\u00e9s de la cadena de prototipos cuando el objeto de opciones del llamador no tiene filename como una propiedad propia. Cuando Object.prototype.filename es contaminado aguas arriba, el valor heredado fluye a la importaci\u00f3n de worker_threads.Worker y el .mjs del atacante se ejecuta en el worker. Esta vulnerabilidad est\u00e1 corregida en 6.0.0-rc.2, 5.2.0 y 4.9.3."}], "id": "CVE-2026-55388", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55388", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-23T15:50:15.219533Z", "version": "2.0.3"}}]}, "published": "2026-06-22T18:16:47.930", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-1321"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "piscina: piscina: Arbitrary code execution via prototype pollution of filename option", "id": "2491452", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491452"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-915", "details": ["A flaw was found in piscina, a Node.js worker pool implementation. This vulnerability allows an attacker to achieve arbitrary code execution by exploiting a prototype pollution issue. By manipulating the `filename` option, an attacker can cause their malicious code to be executed within the worker, potentially compromising the system's confidentiality, integrity, and availability."], "name": "CVE-2026-55388", "public_date": "2026-06-22T16:50:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55388\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55388\nhttps://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg"], "statement": "This is an Important flaw due to arbitrary code execution via prototype pollution. Red Hat products are not affected by this vulnerability as the vulnerable code is not present in Red Hat's `piscina` implementation.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.9.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0-alpha.0,5.2.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.0.0-rc.1,6.0.0-rc.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "piscina", "source": "cna", "vendor": "piscinajs"}, "product": "piscina", "vendor": "piscinajs"}], "created": "2026-06-22T19:15:04.395102+00:00", "updated": "2026-06-26T04:15:11.081934+00:00", "vendors": ["piscinajs", "piscinajs$PRODUCT$piscina"]}