{"cve":"CVE-2026-57439","nvd":{"published":"2026-07-08T16:16:31.280","modified":"2026-10-25T20:10:00.147","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":5.0},"cwes":["CWE-79","CWE-1321"],"references":["https://github.com/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948f","https://github.com/gchq/CyberChef/issues/2568","https://github.com/gchq/CyberChef/pull/2569","https://github.com/gchq/CyberChef/releases/tag/v11.2.0","https://github.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:34.550481224+00:00"},"epss":{"cve":"CVE-2026-57439","score":0.00244,"percentile":0.15434,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-fx6f-382r-j72c","url":"https://osv.dev/vulnerability/GHSA-fx6f-382r-j72c","summary":"CyberChef: Prototype pollution in Series Chart operation","modified":"2026-09-24T19:45:04.823027737Z","packages":[{"ecosystem":"npm","name":"cyberchef","purl":"pkg:npm/cyberchef","ranges":["<11.2.0"],"fixed":["11.2.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}