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CVE-2025-55164

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Date: August 12, 2025

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.

Severity Score

Related Resources (8)

https://www.vicarius.io/vsociety/posts/cve-2025-55164-mitigate-csp-parser-vulnerability
https://github.com/helmetjs/content-security-policy-parser
https://github.com/helmetjs/content-security-policy-parser/issues/11
https://www.vicarius.io/vsociety/posts/cve-2025-55164-detect-node-csp-parser-vulnerability
https://github.com/helmetjs/content-security-policy-parser/commit/b13a52554f0168af393e3e38ed4a94e9e6aea9dc
https://nvd.nist.gov/vuln/detail/CVE-2025-55164
https://github.com/helmetjs/content-security-policy-parser/security/advisories/GHSA-w2cq-g8g3-gm83
https://www.mend.io/vulnerability-database/CVE-2025-55164

Severity Score

Weakness Type (CWE)

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CWE-1321

Top Fix

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Upgrade Version

Upgrade to version content-security-policy-parser - 0.6.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): HIGH

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