PT-2025-32688 · Unknown+1 · Content-Security-Policy-Parser+1

Mortem · Published 2025-08-12 · Updated 2025-08-12 · CVE-2025-55164

Positive Technologies (AI Summary)

CVSS v4.0

8.8

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions: content-security-policy-parser versions 0.5.0 and earlier

Description: The content-security-policy-parser software parses content security policy directives. A prototype pollution vulnerability exists in versions 0.5.0 and earlier, where calling a policy name as proto allows overriding the Object prototype. This issue is addressed in version 0.6.0. A workaround involves disabling prototype method in NodeJS to neutralize prototype pollution attacks.

Recommendations: content-security-policy-parser versions prior to 0.6.0: Update to version 0.6.0 or later. content-security-policy-parser versions prior to 0.6.0: Use either the --disable-proto=delete or --disable-proto=throw argument when running NodeJS.

Exploit

Fix

Prototype Pollution

Weakness Enumeration

CWE-1321

Related Identifiers

CVE-2025-55164

GHSA-W2CQ-G8G3-GM83

Affected Products

Node.Js

Content-Security-Policy-Parser

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55164.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-55164 · Security Note
• https://osv.dev/vulnerability/GHSA-w2cq-g8g3-gm83 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-55164 · Vendor Advisory
• https://github.com/helmetjs/content-security-policy-parser/security/advisories/GHSA-w2cq-g8g3-gm83 · Note
• https://github.com/helmetjs/content-security-policy-parser/issues/11 · Note
• https://github.com/helmetjs/content-security-policy-parser · Note
• https://github.com/helmetjs/content-security-policy-parser/commit/b13a52554f0168af393e3e38ed4a94e9e6aea9dc · Note
• https://twitter.com/CVEnew/status/1955311110472794153 · Twitter Post
• https://vicarius.io/vsociety/posts/cve-2025-55164-detect-node-csp-parser-vulnerability · Note
• https://twitter.com/CveFindCom/status/1955308252800934369 · Twitter Post
• https://vicarius.io/vsociety/posts/cve-2025-55164-mitigate-csp-parser-vulnerability · Note