# CVE-2026-8763: bouncycastle: In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI

CVE-2026-8763 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-8763, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-8763
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 3, 2026

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bouncycastle Debian 14 | 1.86-1 | [DEBIAN-CVE-2026-8763](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8763.md) | Aug 3, 2026 |
| Linux | bouncycastle amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle opensuse-leap 16.0 | 1.85-160000.1.1 | [OPENSUSE-SU-2026:21538-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21538-1.md) | Aug 6, 2026 |
| Linux | bouncycastle sles 15.6 | 1.85-150200.3.38.1 | [SUSE-SU-2026:3559-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3559-1.md) | Aug 10, 2026 |
| Linux | bouncycastle sles 15.7 | 1.85-150200.3.38.1 | [SUSE-SU-2026:3559-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3559-1.md) | Aug 10, 2026 |
| Linux | bouncycastle sles 16.0 | 1.85-160000.1.1 | [SUSE-SU-2026:23150-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23150-1.md) | Aug 6, 2026 |
| Linux | bouncycastle-javadoc amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle-mail amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle-pg amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle-pkix amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle-tls amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |
| Linux | bouncycastle-util amzn 2023 | 1.70-4.amzn2023.0.8 | [ALAS2023-2026-2153](https://patchblox.com/security/data/fix/linux/alas2023-2026-2153.md) | Sep 14, 2026 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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