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High · 8.8 CVE-2025-55164 EUVD-2025-24266GHSA-w2cq-g8g3-gm83

content-security-policy-parser Prototype Pollution Vulnerability May Lead to RCE

Published Aug 12, 2025 · Updated Aug 20, 2025 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
helmetjs content-security-policy-parser < 0.6.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm content-security-policy-parser < 0.6.0 0.6.0 GHSA-w2cq-g8g3-gm83

References