CVE-2026-8763 PUBLISHED

Name Constraints bypass via trailing dot in rfc822Name and URI

Assigner: bcorg
Reserved: 17.05.2026 Published: 03.08.2026 Updated: 03.08.2026

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).

Metrics

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
CVSS Score: 9.3

Product Status

Vendor Legion of the Bouncy Castle Inc.
Product BC-JAVA
Versions Default: unaffected
  • affected from 0 to 1.85 (excl.)
Vendor Legion of the Bouncy Castle Inc.
Product BC-LTS-JAVA
Versions Default: unaffected
  • affected from 2.73.0 to 2.73.12 (excl.)
Vendor Legion of the Bouncy Castle Inc.
Product BC-FJA
Versions Default: unaffected
  • affected from 1.0.0 to 1.0.2.7 (excl.)
  • affected from 2.0.0 to 2.0.2 (excl.)
  • affected from 2.1.0 to 2.1.3 (excl.)

Credits

  • Alex Gaynor in collaboration with Claude and Anthropic Research reporter

References

Problem Types

  • CWE-295 Improper Certificate Validation CWE