CVE-2026-5588

UNKNOWN 0.0

PKIX draft CompositeVerifier accepts empty signature sequence as valid.

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

8th

: 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.

CWE	CWE-327
Vendor	legion of the bouncy castle inc.
Product	bc-java
Published	Apr 15, 2026
Last Updated	Apr 15, 2026

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Affected Versions

Legion of the Bouncy Castle Inc. / BC-JAVA

1.67 < 1.84

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588

Credits

Nicholas Carlini using Claude, Anthropic