CVE-2026-5588

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Legion of the Bouncy Castle Inc.BC-JAVA1.67 < 1.80.2affected
Legion of the Bouncy Castle Inc.BC-JAVA1.81 < 1.81.1affected
Legion of the Bouncy Castle Inc.BC-JAVA1.82 < 1.84affected
Legion of the Bouncy Castle Inc.BCPKIX-FIPS2.0.6 < 2.0.11affected
Legion of the Bouncy Castle Inc.BCPKIX-FIPS2.1.7 < 2.1.11affected
Legion of the Bouncy Castle Inc.BCPIX-LTS2.73.7 < 2.73.11affected

Weaknesses

  • CWE-327: CWE-327 Use of a Broken or Risky Cryptographic Algorithm

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

bouncycastle: BC-JAVA: PKIX draft CompositeVerifier accepts empty signature sequence as valid

Additional References

References