CVE-2025-13204

Silentmatt JavaScript Expression Evaluator vulnerability

7.3 HIGHPublic exploitEPSS 0.45%

Published14 Nov 2025

Description

npm package `expr-eval` 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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Silentmatt JavaScript Expression Evaluatorall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Patch & vendor advisories

https://github.com/silentmatt/expr-eval/pull/252/files

References

https://github.com/jorenbroekema/expr-evalProduct
https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.pyProduct
https://github.com/silentmatt/expr-evalProduct
https://github.com/silentmatt/expr-eval/pull/252/filesIssue TrackingPatch
https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.pyProduct
https://www.huntr.dev/bounties/1-npm-expr-eval/ExploitThird Party Advisory
https://www.npmjs.com/package/expr-eval-forkProduct

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-13204 being actively exploited?

CVE-2025-13204 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.45%.

How severe is CVE-2025-13204?

CVE-2025-13204 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 0.45% probability of exploitation.

Which products are affected by CVE-2025-13204?

Affected products include Silentmatt JavaScript Expression Evaluator.

How do I fix CVE-2025-13204?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-13204 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.