What’s Vulnerable › Vulnerabilities

CVE-2025-13204: CVE-2025-13204

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-14 · updated 2026-10-30
• Weakness: CWE-1321

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.

Affected products

• silentmatt Javascript Expression Evaluator: all versions
• silentmatt expr-eval: through 2.0.2

References

• https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py
• https://github.com/jorenbroekema/expr-eval
• https://github.com/silentmatt/expr-eval
• https://github.com/silentmatt/expr-eval/pull/252/files
• https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py
• https://www.huntr.dev/bounties/1-npm-expr-eval/
• https://www.npmjs.com/package/expr-eval-fork

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