{"id":"CVE-2026-57439","state":"PUBLISHED","title":"CyberChef: Prototype pollution in Series Chart operation","description":"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.","publishedAt":"2026-07-08T14:58:38.693Z","updatedAt":"2026-07-08T16:12:28.118Z","severity":{"score":5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["gchq CyberChef"],"affected":[{"vendor":"gchq","product":"CyberChef","versions":[{"version":"< 11.2.0","status":"affected"}]}],"references":["https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","https://github.com/gchq/CyberChef/issues/2568","https://github.com/gchq/CyberChef/pull/2569","https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f","https://github.com/gchq/CyberChef/releases/tag/v11.2.0"],"weaknesses":["CWE-79","CWE-1321"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/57xxx/CVE-2026-57439.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-57439","state":"PUBLISHED","datePublished":"2026-07-08T14:58:38.693Z","dateUpdated":"2026-07-08T16:12:28.118Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-24T13:21:20.729Z"},"containers":{"cna":{"title":"CyberChef: Prototype pollution in Series Chart operation","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."}],"affected":[{"vendor":"gchq","product":"CyberChef","versions":[{"version":"< 11.2.0","status":"affected"}]}],"references":[{"url":"https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","name":"https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/gchq/CyberChef/issues/2568","name":"https://github.com/gchq/CyberChef/issues/2568","tags":["x_refsource_MISC"]},{"url":"https://github.com/gchq/CyberChef/pull/2569","name":"https://github.com/gchq/CyberChef/pull/2569","tags":["x_refsource_MISC"]},{"url":"https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f","name":"https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f","tags":["x_refsource_MISC"]},{"url":"https://github.com/gchq/CyberChef/releases/tag/v11.2.0","name":"https://github.com/gchq/CyberChef/releases/tag/v11.2.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T14:58:38.693Z"},"source":{"advisory":"GHSA-fx6f-382r-j72c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-08T16:12:11.872931Z","id":"CVE-2026-57439","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-08T16:12:28.118Z"}}]}}}