Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jsrsasign Project | Jsrsasign | < 11.1.1 |
Related Weaknesses (CWE)
References
- https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586ExploitMitigationThird Party Advisory
- https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0ePatch
- https://github.com/kjur/jsrsasign/pull/645Issue Tracking
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941Third Party Advisory
FAQ
What is CVE-2026-4601?
CVE-2026-4601 is a vulnerability with a CVSS score of 8.7 (HIGH). 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 reco...
How severe is CVE-2026-4601?
CVE-2026-4601 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4601?
Check the references section above for vendor advisories and patch information. Affected products include: Jsrsasign Project Jsrsasign.