CVE-2026-8763
Published:August 03, 2026
Updated:August 04, 2026
In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Affected Packages
https://github.com/bcgit/bc-java.git (GITHUB):
Affected version(s) >=r1rv60 <r1rv85Fix Suggestion:
Update to version r1rv85org.bouncycastle:bc-fips (JAVA):
Affected version(s) >=2.0.0 <2.0.2Fix Suggestion:
Update to version 2.0.2org.bouncycastle:bcprov-lts8on (JAVA):
Affected version(s) >=2.73.0 <2.73.12Fix Suggestion:
Update to version 2.73.12org.bouncycastle:bc-fips (JAVA):
Affected version(s) >=2.1.0 <2.1.3Fix Suggestion:
Update to version 2.1.3org.bouncycastle:bcprov-jdk18on (JAVA):
Affected version(s) >=1.71 <1.85Fix Suggestion:
Update to version 1.85org.bouncycastle:bcprov-jdk15to18 (JAVA):
Affected version(s) >=1.63 <1.85Fix Suggestion:
Update to version 1.85org.bouncycastle:bc-fips (JAVA):
Affected version(s) >=1.0.0 <1.0.2.7Fix Suggestion:
Update to version 1.0.2.7Related Resources (10)
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Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Certificate Validation
EPSS
Base Score:
0.33