VULNERABILITY INTELLIGENCE

CVE-2026-59638

CVSS score9.3 CRITICAL
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-08-03
Last modified2026-08-28
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber

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).

Weakness classification

  • CWE-297: Improper Validation of Certificate with Host Mismatch

Primary references