CVE-2026-5588

HIGH

PKIX draft CompositeVerifier accepts empty signature sequence as valid.

Title source: cna
STIX 2.1

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.

References (15)

Core 15
Core References

Scores

CVSS v3 7.5
EPSS 0.0039
EPSS Percentile 31.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-327 CWE-347
Status published
Products (15)
Legion of the Bouncy Castle Inc./BC-JAVA 1.49 - 1.84
Legion of the Bouncy Castle Inc./BC-JAVA 1.67 - 1.80.2
Legion of the Bouncy Castle Inc./BC-JAVA 1.67 - 1.84
Legion of the Bouncy Castle Inc./BC-JAVA 1.81 - 1.81.1
Legion of the Bouncy Castle Inc./BC-JAVA 1.82 - 1.84
Legion of the Bouncy Castle Inc./BCPIX-LTS 2.73.7 - 2.73.11
Legion of the Bouncy Castle Inc./BCPKIX-FIPS 2.0.6 - 2.0.11
Legion of the Bouncy Castle Inc./BCPKIX-FIPS 2.1.7 - 2.1.11
org.bouncycastle/bcpkix-debug-jdk14 1.49 - 1.84Maven
org.bouncycastle/bcpkix-debug-jdk15to18 1.49 - 1.84Maven
... and 5 more
Published Apr 15, 2026
Tracked Since Apr 15, 2026