CVE-2026-8763Name Constraints bypass via trailing dot in rfc822Name and URI
Updated under an hour ago ()
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It affects Legion of the Bouncy Castle Inc. BC-JAVA and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 9.3 CRITICAL (v4.0, CNA)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
- Weakness (CWE)
- CWE-295
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- bcorg
- NVD analysis
- Analyzed
- Record last updated
- Oct 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Legion of the Bouncy Castle Inc. BC-JAVA legion_of_the_bouncy_castle:bc_java (from the name) | before 1.85 | CNA record |
Legion of the Bouncy Castle Inc. BC-LTS-JAVA legion_of_the_bouncy_castle:bc_lts_java (from the name) | from 2.73.0 before 2.73.12 | CNA record |
Legion of the Bouncy Castle Inc. BC-FJA legion_of_the_bouncy_castle:bc_fja (from the name) | from 1.0.0 before 1.0.2.7; from 2.0.0 before 2.0.2; from 2.1.0 before 2.1.3 | CNA record |
bouncycastle bc-java bouncycastle:bc-java | before 1.85 | NVD |
bouncycastle bouncy_castle_for_java_lts bouncycastle:bouncy_castle_for_java_lts | through 2.73.11 | NVD |
bouncycastle fips_java_api bouncycastle:fips_java_api | from 1.0.0 before 1.0.2.7; from 2.0.0 before 2.0.2; from 2.1.0 before 2.1.3 | NVD |
References
- https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908763vendor-advisory, third-party-advisory, patch
- https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.