Use of a broken or risky cryptographic algorithm in The Bouncy Castle Crypto Package For Java - CVE-2026-5588

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Main Vulnerability Database Vulnerabilities #VU132260

Use of a broken or risky cryptographic algorithm in The Bouncy Castle Crypto Package For Java - CVE-2026-5588

Published: May 25, 2026


Vulnerability identifier: #VU132260
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5588
CWE-ID: CWE-327
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Legion of the Bouncy Castle Inc.
Affected software:
The Bouncy Castle Crypto Package For Java

Detailed vulnerability description

The vulnerability allows a remote attacker to bypass signature verification.

The vulnerability exists due to use of a broken or risky cryptographic algorithm in the PKIX draft CompositeVerifier when processing composite signatures. A remote attacker can provide an empty signature sequence to bypass signature verification.


How to mitigate CVE-2026-5588

Install security update from vendor's website.

Sources