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Security Database

CVE

CWE

Training

CVE-2025-13204

Published: Nov 14, 2025

Modified: Nov 14, 2025

PUBLISHED

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.

Vendor	Product	Versions
silentmatt	expr-eval	affected `0 - <= 2.0.2`

References

https://www.npmjs.com/package/expr-eval-fork

https://github.com/silentmatt/expr-eval

https://github.com/jorenbroekema/expr-eval

https://www.huntr.dev/bounties/1-npm-expr-eval/

third-party-advisory

https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py

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

patch

https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py

exploit

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