Unrated severityOSV Advisory· Published Aug 4, 2026

Debian bouncycastle: In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enable…

CVE-2026-59638

Description

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

Legion Of The Bouncy Castle Inc./Bc Lts JavaOSV
Range: r2rv73dot11, r2rv73dot10, r2rv73dot9, …
Debian/bouncycastlellm-fuzzy
Range: <1.85
Legion Of The Bouncy Castle Inc./Bouncy Castle for Javallm-fuzzy
Range: <1.85
Legion Of The Bouncy Castle Inc./Bouncy Castle for Java FIPS bc-fipsllm-fuzzy
Range: <1.0.24, <2.0.24, <2.1.24

Patches

Vulnerability mechanics

News mentions

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