CVE-2026-59643 OpenPGP inline-signature policy failures silently ignored
Attackers can bypass OpenPGP inline-signature policy checks in Bouncy Castle for Java, potentially accepting invalid signatures as valid.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59643?
CVE-2026-59643 is a high-severity vulnerability in Bouncycastle Bc-Java, published on 3 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-59643?
It affects 2 products.
Products include Bouncycastle Bc-Java, Bouncycastle Bcpg-Fips.
How do I fix CVE-2026-59643?
Upgrade to a fixed version.
Is CVE-2026-59643 being exploited?
There is no known exploitation of CVE-2026-59643 in the wild and no public exploit code.
Other vulnerabilities in Bouncycastle Bc-Java
- CVE-2007-6721 Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability
- CVE-2018-1000613 Deserialization of Untrusted Data in Bouncy castle
- CVE-2026-58062 Stapled OCSP response accepted without binding to the checked certificate
- CVE-2026-59638 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
- CVE-2026-59650 MTI/A0 DH agreement exponentiates unvalidated peer value
Sources
Also known as CLEANSTART-2026-CP07297, CLEANSTART-2026-CU69447, CLEANSTART-2026-LQ15111, DEBIAN-CVE-2026-59643, GHSA-r7xx-x336-xqqr, UBUNTU-CVE-2026-59643.