{"id":"CVE-2026-57439","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T16:16:31.280","lastModified":"2026-10-25T20:10:00.147","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0."},{"lang":"es","value":"CyberChef es una aplicación web para cifrado, codificación, compresión y análisis de datos. Antes de la versión 11.2.0, la operación Series Chart acepta ’__proto__’ como clave mientras analiza CSV proporcionado por el usuario, lo que permite la contaminación de prototipos que puede encadenarse con operaciones como Parse UDP para inyectar JavaScript malicioso en la salida HTML. Este problema está solucionado en la versión 11.2.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"gchq","product":"CyberChef","versions":[{"version":"< 11.2.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","baseScore":5.0,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":2.7}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-08T16:12:11.872931Z","id":"CVE-2026-57439","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-79"},{"lang":"en","value":"CWE-1321"}]}],"references":[{"url":"https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f","source":"security-advisories@github.com"},{"url":"https://github.com/gchq/CyberChef/issues/2568","source":"security-advisories@github.com"},{"url":"https://github.com/gchq/CyberChef/pull/2569","source":"security-advisories@github.com"},{"url":"https://github.com/gchq/CyberChef/releases/tag/v11.2.0","source":"security-advisories@github.com"},{"url":"https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","source":"security-advisories@github.com"},{"url":"https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}