CVE-2026-5588
Published:April 15, 2026
Updated:April 23, 2026
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). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.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.
Affected Packages
https://github.com/bcgit/bc-java.git (GITHUB):
Affected version(s) >=r1rv49 <r1rv84Fix Suggestion:
Update to version r1rv84org.bouncycastle:bcpkix-debug-jdk15to18 (JAVA):
Affected version(s) >=1.73 <1.84Fix Suggestion:
Update to version 1.84org.bouncycastle:bcpkix-jdk14 (JAVA):
Affected version(s) >=1.49 <1.84Fix Suggestion:
Update to version 1.84org.bouncycastle:bcpkix-debug-jdk18on (JAVA):
Affected version(s) >=1.73 <1.84Fix Suggestion:
Update to version 1.84org.bouncycastle:bcpkix-jdk15to18 (JAVA):
Affected version(s) >=1.63 <1.84Fix Suggestion:
Update to version 1.84org.bouncycastle:bcpkix-jdk18on (JAVA):
Affected version(s) >=1.71 <1.84Fix Suggestion:
Update to version 1.84org.bouncycastle:bcpkix-debug-jdk14 (JAVA):
Affected version(s) >=1.81 <1.84Fix Suggestion:
Update to version 1.84Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Use of a Broken or Risky Cryptographic Algorithm
EPSS
Base Score:
0.01
