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

> CVE-2026-8763: Name Constraints bypass via trailing dot in rfc822Name and URI. CVSS 9.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-8763
Last updated: 2026-10-05T01:16:57Z

- Published: 2026-08-03 00:36 UTC · Updated: 2026-10-05 01:16 UTC · Assigner: bcorg
- CVSS: 9.1 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.43%, 37th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-295

## Description

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).

## Affected vendors and products

- Legion of the Bouncy Castle Inc.: BC-FJA
- Legion of the Bouncy Castle Inc.: BC-JAVA
- Legion of the Bouncy Castle Inc.: BC-LTS-JAVA

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-8763)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-8763)
- [https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558](https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558)
- [https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908763](https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%908763)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-8763 · Markdown: https://rewindex.com/cve/CVE-2026-8763.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-8763 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:04.236Z