CVE-2025-55164
Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
12/08/2025
Last modified:
20/08/2025
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.
Impact
Base Score 4.0
8.80
Severity 4.0
HIGH
References to Advisories, Solutions, and Tools
- 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