{"cve":"CVE-2026-4601","nvd":{"published":"2026-03-23T06:16:21.893","modified":"2026-09-10T13:20:22.510","status":"Modified","description":"Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:N/E:P","score":8.8},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-325"],"references":["https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586","https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb","https://github.com/kjur/jsrsasign/pull/645","https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-15812269","https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941"],"products":["kjur:jsrsasign"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4601","score":0.00305,"percentile":0.23344,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w8q8-93cx-6h7r","url":"https://osv.dev/vulnerability/GHSA-w8q8-93cx-6h7r","summary":"jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction","modified":"2026-03-29T16:11:30.182175Z","packages":[{"ecosystem":"npm","name":"jsrsasign","purl":"pkg:npm/jsrsasign","ranges":["<11.1.1"],"fixed":["11.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}