Vulnerability in Bouncycastle Bc-Java
CVE-2026-58062
In Bouncy Castle for Java before 1.85, Stapled OCSP response accepted without binding to the checked certificate. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Vulnerability class: Improper Certificate Validation
EPSS: 0.003 (27.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Bouncycastle Bc-java
- Bouncycastle Bouncy_castle_for_java_lts
- Bouncycastle Fips_java_api
- Legion Of The Bouncy Castle Inc. Bc-fja — versions 2.0.0, 2.1.0
- Legion Of The Bouncy Castle Inc. Bc-java — versions 1.66
- Legion Of The Bouncy Castle Inc. Bc-lts-java — versions 2.73.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (Patch, patch)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-58062?
- CVE-2026-58062 is a critical-severity vulnerability in Bouncycastle Bc-Java, classified under Improper Certificate Validation. CVSS score: 9.1/10. Published 2026-08-03.
- How severe is CVE-2026-58062?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2026-58062 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.