Vulnerability Description
In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
Related Weaknesses (CWE)
References
- https://github.com/bcgit/bc-java/commit/99ddc6dcc6782e6a76b0dd587c77e62eb7096ad0
- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059639
FAQ
What is CVE-2026-59639?
CVE-2026-59639 is a documented vulnerability. In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java...
How severe is CVE-2026-59639?
CVSS scoring is not yet available for CVE-2026-59639. Check NVD for updates.
Is there a patch for CVE-2026-59639?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.