CVE-2025-12735: Silentmatt JavaScript Expression Evaluator code injection (CVSS 9.8)

Description

The expr-eval library is a JavaScript expression parser and evaluator designed to safely evaluate mathematical expressions with user-defined variables. However, due to insufficient input validation, an attacker can pass a crafted context object or use MEMBER of the context object into the evaluate() function and trigger arbitrary code execution.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Jorenbroekema JavaScript Expression Evaluator3.0.0

Silentmatt JavaScript Expression Evaluator≤ 2.0.2

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/288

References

https://github.com/advisories/GHSA-jc85-fpwf-qm7xThird Party Advisory
https://github.com/jorenbroekema/expr-evalProduct
https://github.com/jorenbroekema/expr-eval/blob/460b820ba01c5aca6c5d84a7d4f1fa5d1913c67b/test/security.jsProduct
https://github.com/silentmatt/expr-evalProduct
https://github.com/silentmatt/expr-eval/pull/288Issue TrackingPatch
https://kb.cert.org/vuls/id/263614Third Party Advisory
https://www.kb.cert.org/vuls/id/263614Third Party Advisory
https://www.npmjs.com/package/expr-evalProduct
https://www.npmjs.com/package/expr-eval-forkProduct

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-12735 being actively exploited?

CVE-2025-12735 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.76%.

How severe is CVE-2025-12735?

CVE-2025-12735 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.76% probability of exploitation.

Which products are affected by CVE-2025-12735?

Affected products include Jorenbroekema JavaScript Expression Evaluator, Silentmatt JavaScript Expression Evaluator.

How do I fix CVE-2025-12735?

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

How Secuno handles this

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