CVE-2026-8763 CRITICAL

CVE-2026-8763: Name Constraints bypass via trailing dot in rfc822Name and URI

Vendor Legion Of The Bouncy Castle Inc.
Product BC-JAVA
Weakness CWE-295
Published August 3, 2026
Last update August 3, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber

What the vulnerability does

01Description

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).

Key dates

02Disclosure timeline

August 3, 2026 CVE published
August 3, 2026 Record updated