CVE-2025-13204npm package `expr-eval` is vulnerable to Prototype Pollution.
Updated under an hour ago ()
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It affects silentmatt javascript_expression_evaluator. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.3 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
silentmatt javascript_expression_evaluator silentmatt:javascript_expression_evaluator | all versions | NVD |
References
- https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.pyproduct
- https://github.com/jorenbroekema/expr-evalproduct
- https://github.com/silentmatt/expr-evalproduct
- https://github.com/silentmatt/expr-eval/pull/252/filesissue-tracking, patch
- https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.pyproduct
- https://www.huntr.dev/bounties/1-npm-expr-eval/exploit, third-party-advisory
- https://www.npmjs.com/package/expr-eval-forkproduct
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.