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Vulnerabilities

Vulnerability · CVE-2025-13204

npm package is vulnerable to Prototype Pollution.

Published Nov 14, 2025 · catalog updated Oct 30, 2026 · javascript expression evaluator

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-13204. EPSS is 0.85%. Act only if a listed version of javascript expression evaluator is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.85%
Remediation
Vendor / distro source
Affected products
cpe silentmatt/javascript expression evaluator · vendor silentmatt expr-eval 0 ≤2.0.2

npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe silentmatt/javascript expression evaluatorversion unspecified
  • vendor silentmatt expr-eval 0 ≤2.0.20 ≤2.0.2

How to fix CVE-2025-13204

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-13204. EPSS is 0.85%. Act only if a listed version of javascript expression evaluator is installed.

Which versions are affected?

Compare what you have installed with silentmatt expr-eval 0 ≤2.0.2 0 ≤2.0.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). EPSS 0.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 14, 2025 · EUVD

    Detected

    npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

  2. Nov 14, 2025 · EUVD

    Updated

    npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

  3. Oct 30, 2026 · NIST NVD

    Updated

    npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

Sources

  • CVE.orgVulnerability recordCVE-2025-13204

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-13204

    30-day exploitation probability 0.85%

    first.org
  • EUVDVulnerability recordEUVD-2025-197614

    npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-2025-13204

    npm package is vulnerable to Prototype Pollution. An attacker with access to express eval interface can use JavaScript prototype-based inheritance model to achieve arbitrary code execution. The npm expr-eval-fork package resolves this issue.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • NIST NVDOct 31, 2026
  • CVE.orgOct 25, 2026
  • EUVDOct 25, 2026