{"id":"CVE-2025-13204","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-13204","generatedAt":"2026-11-04T11:42:45.941Z","title":"npm package `expr-eval` is vulnerable to Prototype Pollution.","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.","published":"2025-11-14T17:16:02.000Z","lastModified":"2026-10-30T19:17:40.000Z","status":"Modified","sourceIdentifier":"cret@cert.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-1321"],"affected":["silentmatt/javascript expression evaluator"],"epss":{"score":0.00851,"percentile":0.58259,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"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."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-30T20:45:08.000Z","detail":{"from":"7.3","score":"9.8","severity":"CRITICAL","fromSeverity":"HIGH"},"summary":"Now scored CVSS 9.8 CRITICAL (was 7.3)."}],"references":[{"url":"https://github.com/SECCON/SECCON2022_final_CTF/blob/main/jeopardy/web/babybox/solver/solver.py","tags":["Product"],"source":"cret@cert.org"},{"url":"https://github.com/jorenbroekema/expr-eval","tags":["Product"],"source":"cret@cert.org"},{"url":"https://github.com/silentmatt/expr-eval","tags":["Product"],"source":"cret@cert.org"},{"url":"https://github.com/silentmatt/expr-eval/pull/252/files","tags":["Issue Tracking","Patch"],"source":"cret@cert.org"},{"url":"https://github.com/vladko312/extras/blob/f549d505af300fd74a01b46fab2102990ff1c14d/expr-eval.py","tags":["Product"],"source":"cret@cert.org"},{"url":"https://www.huntr.dev/bounties/1-npm-expr-eval/","tags":["Exploit","Third Party Advisory"],"source":"cret@cert.org"},{"url":"https://www.npmjs.com/package/expr-eval-fork","tags":["Product"],"source":"cret@cert.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-13204","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}