Riskcovery

CVE-2026-5588

PKIX draft CompositeVerifier accepts empty signature sequence as valid.

State
Published
Severity
6.3 Medium
Published
Apr 15, 2026
Updated
Sep 18, 2026
Reserved
Apr 4, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
4.06.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amberbcorg
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nredhat-SADP

Weaknesses

  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm
  • CWE-347 Improper Verification of Cryptographic Signature

Affected Products

ProductVersions
BC-JAVALegion of the Bouncy Castle Inc.
  • 1.67 to before 1.80.2Affected
  • 1.81 to before 1.81.1Affected
  • 1.82 to before 1.84Affected
BCPKIX-FIPSLegion of the Bouncy Castle Inc.
  • 2.0.6 to before 2.0.11Affected
  • 2.1.7 to before 2.1.11Affected
BCPIX-LTSLegion of the Bouncy Castle Inc.
  • 2.73.7 to before 2.73.11Affected

References

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