Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-9pwp-9qqc-pr26
Advisory ID github_osv/GHSA-9pwp-9qqc-pr26
Aliases CVE-2026-8763
Summary Bouncy Castle: Name Constraints bypass via trailing dot in rfc822Name and URI 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).
Status Published
Exploitability 0.5
Weighted Severity 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-295 Improper Certificate Validation
System Score Found at
cvssv3.1 9.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9pwp-9qqc-pr26/GHSA-9pwp-9qqc-pr26.json
cvssv4 9.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9pwp-9qqc-pr26/GHSA-9pwp-9qqc-pr26.json
generic_textual CRITICAL
Reference id Reference type URL
https://github.com/bcgit/bc-java
https://github.com/bcgit/bc-java/releases/tag/r1rv85v2
https://github.com/bcgit/bc-java/wiki/CVE-2026-8763
2c28b253a44681fbbc562561eab6ad383d2ae558 Other https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558
CVE-2026-8763 https://nvd.nist.gov/vuln/detail/CVE-2026-8763
CVE%E2%80%902026%E2%80%908763 Advisory https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908763
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9pwp-9qqc-pr26/GHSA-9pwp-9qqc-pr26.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9pwp-9qqc-pr26/GHSA-9pwp-9qqc-pr26.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.