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

2th

Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.

CWE	CWE-327
Vendor	legion of the bouncy castle inc.
Product	bc-java
Published	Apr 15, 2026
Last Updated	May 18, 2026

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Affected Versions

Legion of the Bouncy Castle Inc. / BC-JAVA

1.67 < 1.80.2 1.81 < 1.81.1 1.82 < 1.84

Legion of the Bouncy Castle Inc. / BCPKIX-FIPS

2.0.6 < 2.0.11 2.1.7 < 2.1.11

Legion of the Bouncy Castle Inc. / BCPIX-LTS

2.73.7 < 2.73.11

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588 github.com: https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057

Credits

Nicholas Carlini using Claude, Anthropic