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CVE-2026-8763 — Vulnerability in org.bouncycastle:bcprov-jdk15to18...

CRITICAL

Bouncy Castle: Name Constraints bypass via trailing dot in rfc822Name and URI

Published August 3, 2026Updated September 18, 2026Source: osv

Summary

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).

Advisory Timeline

  • First published August 3, 2026 (70 days ago).
  • Last revised September 18, 2026 — 47 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven
Update org.bouncycastle:bcprov-jdk15to18 to 1.85 or later
<!-- Update pom.xml dependency version to 1.85 for org.bouncycastle:bcprov-jdk15to18 -->
Maven
Update org.bouncycastle:bc-fips to 2.1.3 or later
<!-- Update pom.xml dependency version to 2.1.3 for org.bouncycastle:bc-fips -->
Maven
Update org.bouncycastle:bcprov-lts8on to 2.73.12 or later
<!-- Update pom.xml dependency version to 2.73.12 for org.bouncycastle:bcprov-lts8on -->
Maven
Update org.bouncycastle:bc-fips to 2.0.2 or later
<!-- Update pom.xml dependency version to 2.0.2 for org.bouncycastle:bc-fips -->
Maven
Update org.bouncycastle:bcprov-jdk18on to 1.85 or later
<!-- Update pom.xml dependency version to 1.85 for org.bouncycastle:bcprov-jdk18on -->
Maven
Update org.bouncycastle:bc-fips to 1.0.2.7 or later
<!-- Update pom.xml dependency version to 1.0.2.7 for org.bouncycastle:bc-fips -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (6)

Affects 1 ecosystem: maven (4).

PackageEcosystemAffectedFixed In
org.bouncycastle:bcprov-jdk15to18
maven
1.63, 1.64, 1.65, 1.66 (+19 more)1.85
org.bouncycastle:bc-fips
maven
2.1.0, 2.1.1, 2.1.22.1.3
org.bouncycastle:bcprov-lts8on
maven
2.73.0, 2.73.1, 2.73.10, 2.73.11 (+8 more)2.73.12
org.bouncycastle:bc-fips
maven
2.0.0, 2.0.12.0.2
org.bouncycastle:bcprov-jdk18on
maven
1.71, 1.71.1, 1.72, 1.73 (+14 more)1.85
org.bouncycastle:bc-fips
maven
1.0.0, 1.0.1, 1.0.2, 1.0.2.1 (+4 more)1.0.2.7

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-295
    Improper Certificate ValidationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-8763?
Bouncy Castle: Name Constraints bypass via trailing dot in rfc822Name and URI This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-8763?
CVE-2026-8763 affects org.bouncycastle:bcprov-jdk15to18, org.bouncycastle:bc-fips and org.bouncycastle:bcprov-lts8on (and 1 more). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-8763 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-9pwp-9qqc-pr26

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