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CVE PROGRAM SOURCE RECORD9.3 Critical

CVE-2026-59638

JSSE hostname verifier CN-fallback enabled by default despite documented opt-in

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Status
Published
Published
Updated
Assigning organization
bcorg

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Legion of the Bouncy Castle Inc. BC-JAVA

Default version status: unaffected

  • 1.61 to < 1.85affected
pkg:maven/org.bouncycastle/bctls-jdk18on

Legion of the Bouncy Castle Inc. BC-LTS-JAVA

Default version status: unaffected

  • 2.73.0 to < 2.73.12affected
pkg:maven/org.bouncycastle/bctls-lts8on

Legion of the Bouncy Castle Inc. BC-FJA

Default version status: unaffected

  • 1.0.7 to < 1.0.24affected
  • 2.0.0 to < 2.0.24affected
  • 2.1.0 to < 2.1.24affected
pkg:maven/org.bouncycastle/bctls-fips

References