CVE-2025-13204
npm package `expr-eval` is vulnerable to Prototype Pollution.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.85% probability · 58th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-1321
- Affected
- silentmatt/javascript expression evaluator
- Source
- cret@cert.org
EPSS 0.9% since 3 November 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.