CVE-2026-59638
In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).
- Affected products
- Bouncy Castle For Java
- Fix
- Available
- CVSS 4.0
- 9.3 CRITICAL
- EPSS
- 0.3% (20th percentile)
- Weakness
- CWE-297
- NVD status
- Undergoing Analysis
- Published
- 2026-08-03
CVE-2026-59638 at NVD
No indexed exploits for CVE-2026-59638 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-59638 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.