Bug#1134196: bouncycastle: CVE-2026-5588

[Salvatore Bonaccorso]

Source: bouncycastle
Version: 1.80-3
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for bouncycastle.

CVE-2026-5588[0]:
| : Use of a Broken or Risky Cryptographic Algorithm vulnerability in
| Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix
| modules).   PKIX draft CompositeVerifier accepts empty signature
| sequence as valid.   This issue affects BC-JAVA: from 1.49 before
| 1.84.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-5588
    https://www.cve.org/CVERecord?id=CVE-2026-5588
[1] https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore