{"cve":"CVE-2025-55164","nvd":{"published":"2025-08-12T16:15:29.253","modified":"2026-06-17T09:41:23.160","status":"Deferred","description":"content-security-policy-parser parses content security policy directives. A prototype pollution vulnerability exists in versions 0.5.0 and earlier, wherein if a policy name is called __proto__, one can override the Object prototype. This issue has been patched in version 0.6.0. A workaround involves disabling prototype method in NodeJS, neutralizing all possible prototype pollution attacks. Provide either --disable-proto=delete (recommended) or --disable-proto=throw as an argument to node to enable this feature.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.8},"cvss_v3":null,"cwes":["CWE-1321"],"references":["https://github.com/helmetjs/content-security-policy-parser/commit/b13a52554f0168af393e3e38ed4a94e9e6aea9dc","https://github.com/helmetjs/content-security-policy-parser/issues/11","https://github.com/helmetjs/content-security-policy-parser/security/advisories/GHSA-w2cq-g8g3-gm83","https://www.vicarius.io/vsociety/posts/cve-2025-55164-detect-node-csp-parser-vulnerability","https://www.vicarius.io/vsociety/posts/cve-2025-55164-mitigate-csp-parser-vulnerability"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:06:45.861874017+00:00"},"epss":{"cve":"CVE-2025-55164","score":0.00441,"percentile":0.38342,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w2cq-g8g3-gm83","url":"https://osv.dev/vulnerability/GHSA-w2cq-g8g3-gm83","summary":"content-security-policy-parser Prototype Pollution Vulnerability May Lead to RCE","modified":"2025-08-12T19:19:42Z","packages":[{"ecosystem":"npm","name":"content-security-policy-parser","purl":"pkg:npm/content-security-policy-parser","ranges":["<0.6.0"],"fixed":["0.6.0"]}]}],"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."]}