CVE-2025-55164

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(medium)
EG Risk
55(Track)
EG Risk 55/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

August 12, 2025

Last Modified

April 15, 2026

Advisory Details (5)

Auto-updated Aug 4, 2026
Patch available. Sources: github_commit, github.
generic

CVE-2025-55164: Mitigate CSP parser vulnerability - vsociety

https://www.vicarius.io/vsociety/posts/cve-2025-55164-mitigate-csp-parser-vulnerability
generic

CVE-2025-55164: Detect Node CSP Parser Vulnerability - vsociety

https://www.vicarius.io/vsociety/posts/cve-2025-55164-detect-node-csp-parser-vulnerability
github Patch Available

content-security-policy-parser Prototype Pollution Vulnerability May Lead to RCE · Advisory · helmetjs/content-security-policy-parser · GitHub

https://github.com/helmetjs/content-security-policy-parser/security/advisories/GHSA-w2cq-g8g3-gm83
generic

If a user provides __proto__ as policy name, behaviour is changed. · Issue #11 · helmetjs/content-security-policy-parser · GitHub

https://github.com/helmetjs/content-security-policy-parser/issues/11
github_commit

commit b13a52554f01 (helmetjs/content-security-policy-parser)

Fix landed in helmetjs/content-security-policy-parser commit b13a52554f01 — awaiting tagged release

https://github.com/helmetjs/content-security-policy-parser/commit/b13a52554f0168af393e3e38ed4a94e9e6aea9dc

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
content-security-policy-parser—0.6.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 182 total refreshes for this CVE.

  1. 2026-09-19 15:42 UTCEPSS rescore
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  11. 2026-08-16 06:29 UTCOSV refresh
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-55164?
CVE-2025-55164 is a high vulnerability published on 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…
When was CVE-2025-55164 disclosed?
CVE-2025-55164 was first published in the National Vulnerability Database on August 12, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-55164 actively exploited?
CVE-2025-55164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.7% of all scored CVEs.
What is the CVSS score of CVE-2025-55164?
CVE-2025-55164 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2025-55164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-55164, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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