medium6.5
CVE-2026-59638
In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Bouncycastle | Bc-Java | before 1.85 |
| Bouncycastle | Bctls-Fips | from 1.0.0 before 1.0.24 from 2.0.19 before 2.0.24 from 2.1.20 before 2.1.24 |
| Bouncycastle | Bouncy Castle For Java Lts | through 2.73.11 |