CVE-2026-59643: OpenPGP inline-signature policy failures silently ignored

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-03 · updated 2026-09-10
Weakness: CWE-347

Description

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.

Affected products

Legion of the Bouncy Castle Inc. BC-JAVA: before 1.85 — fixed in 1.85
Bouncycastle Bcpg-Fips: before 2.0.13 — fixed in 2.0.13

How to fix

Upgrade to a fixed version: Legion of the Bouncy Castle Inc. BC-JAVA 1.85; Bouncycastle Bcpg-Fips 2.0.13. Check the vendor advisory for mitigations.

References

https://github.com/bcgit/bc-java/commit/d3f8cc408b4a36d28e5a410c93436fe3d0fe726b
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059643

Get alerted when CVE-2026-59643 or the next vulnerability affects your stack