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CVE Vulnerability Details :
CVE-2026-5588
PUBLISHED
More InfoOfficial Page
Assigner-bcorg
Assigner Org ID-91579145-5d7b-4cc5-b925-a0262ff19630
View Known Exploited Vulnerability (KEV) details
Published At-15 Apr, 2026 | 09:06
Updated At-08 May, 2026 | 05:29
Rejected At-
▼CVE Numbering Authority (CNA)
PKIX draft CompositeVerifier accepts empty signature sequence as valid.

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 1.84; 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 Products
Vendor
Legion of the Bouncy Castle Inc.
Product
BC-JAVA
Collection URL
https://www.bouncycastle.org/download/bouncy-castle-java/
Package Name
bcpkix
Repo
https://github.com/bcgit/bc-java
Modules
  • pkix
Program Files
  • JcaContentVerifierProviderBuilder.java
Platforms
  • all
Default Status
unaffected
Versions
Affected
  • From 1.67 before 1.84 (maven)
Vendor
Legion of the Bouncy Castle Inc.
Product
BCPKIX-FIPS
Collection URL
https://www.bouncycastle.org/download/bouncy-castle-java-fips/
Package Name
bcpkix
Repo
https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-fips/
Modules
  • pkix
Program Files
  • JcaContentVerifierProviderBuilder.java
Platforms
  • All
Default Status
unaffected
Versions
Affected
  • From 2.0.6 before 2.0.11 (maven)
  • From 2.1.7 before 2.1.11 (maven)
Vendor
Legion of the Bouncy Castle Inc.
Product
BCPIX-LTS
Collection URL
https://www.bouncycastle.org/download/bouncy-castle-java-lts/
Package Name
bcpkix
Repo
https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-lts8on/
Modules
  • pkix
Program Files
  • JcaContentVerfierProviderBuilder.java
Platforms
  • All
Default Status
unaffected
Versions
Affected
  • From 2.73.7 before 2.73.11 (maven)
Problem Types
TypeCWE IDDescription
CWECWE-327CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Type: CWE
CWE ID: CWE-327
Description: CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
CVSS: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:Amber
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS: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:Amber
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Nicholas Carlini using Claude, Anthropic
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588
vendor-advisory
https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057
patch
Hyperlink: https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588
Resource:
vendor-advisory
Hyperlink: https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057
Resource:
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found