Medium severity6.5OSV Advisory· Published Aug 3, 2026· Updated Aug 28, 2026
CVE-2026-59638
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7- Range: r2rv73dot11, r2rv73dot10, r2rv73dot9, …
cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*range: <1.85
- (no CPE)range: <1.85, <2.73.12, <1.0.24, <2.0.24, <2.1.24
- cpe:2.3:a:bouncycastle:bctls-fips:*:*:*:*:*:*:*:*Range: >=1.0.0,<1.0.24
- cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*Range: <=2.73.11
- osv-coords2 versionspkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/bouncycastle&distro=openSUSE%20Tumbleweed
< 1.85-160000.1.1+ 1 more
- (no CPE)range: < 1.85-160000.1.1
- (no CPE)range: < 1.85-1.1
Patches
Vulnerability mechanics
References
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