{"id":"CVE-2025-13204","title":"npm package `expr-eval` is vulnerable to Prototype Pollution","summary":"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 reso…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-1321"],"vendor":"silentmatt","product":"javascript_expression_evaluator","affected":["javascript_expression_evaluator"],"published":"2025-11-14","updated":"2026-10-07","sourceUpdated":"2026-10-07T21:10:00.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-13204","references":[{"url":"https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py","label":"cret@cert.org"},{"url":"https://github.com/jorenbroekema/expr-eval","label":"cret@cert.org"},{"url":"https://github.com/silentmatt/expr-eval","label":"cret@cert.org"},{"url":"https://github.com/silentmatt/expr-eval/pull/252/files","label":"cret@cert.org"},{"url":"https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py","label":"cret@cert.org"},{"url":"https://www.huntr.dev/bounties/1-npm-expr-eval/","label":"cret@cert.org"},{"url":"https://www.npmjs.com/package/expr-eval-fork","label":"cret@cert.org"}],"tags":["nvd"],"epss":0.00452,"epssPercentile":0.37245,"ingestedAt":"2026-10-07T21:54:15.040Z","slug":"CVE-2025-13204","body":"## Overview\n\nnpm 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.\n\n## Affected\n\n- `javascript_expression_evaluator`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}