Vulnerability in Bouncycastle Bc-Java
CVE-2026-59643
In Bouncy Castle for Java before 1.85, OpenPGP inline-signature policy failures silently ignored. This issue also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 2.0.13.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (15.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Bouncycastle Bc-Java
- Bouncycastle Bcpg-Fips
- Legion Of The Bouncy Castle Inc. Bc-Fja — versions 2.0.12
- Legion Of The Bouncy Castle Inc. Bc-Java — versions 1.81
Weakness classification (CWE)
References
- 91579145-5d7b-4cc5-b925-a0262ff19630 (Patch, patch)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)
- 91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-59643?
- CVE-2026-59643 is a high-severity vulnerability in Bouncycastle Bc-Java, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-08-03.
- How severe is CVE-2026-59643?
- High severity. CVSS v3 base score is 7.5 out of 10.