CVEvulnerability

CVE-2026-59638

9.3 CRITICAL Published 2026-08-03 Modified 2026-08-28 Official page ↗
Status
Analyzed
Published
2026-08-03
Last modified
2026-08-28
Assigner
91579145-5d7b-4cc5-b925-a0262ff19630
CVSS 4.0 (91579145-5d7b-4cc5-b925-a0262ff19630)
9.3 CRITICAL — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-297

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 configurations

• bouncycastle bc-java (< 1.85) • bouncycastle bctls-fips (>= 1.0.0 < 1.0.24) • bouncycastle bctls-fips (>= 2.0.19 < 2.0.24) • bouncycastle bctls-fips (>= 2.1.20 < 2.1.24) • bouncycastle bouncy castle for java lts (<= 2.73.11)

Related

Weakness · CWE (1)

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

References