Advisory severityHigh7.4Red Hat Linux

High [CVE-2026-8763] Bouncy Castle for Java: Name Constraints bypass via trailing dot in rfc822Name and URI

This high-severity Red Hat Linux advisory covers CVE-2026-8763 affecting Red Hat Ceph Storage 9, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-8763 Source published Aug 3, 2026Source updated Aug 3, 2026

VulniPulse record published Aug 18, 2026Record updated Aug 18, 2026

CVE-2026-8763

Affected products & platforms

Red Hat LinuxUnclassified

Open source advisory

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Summary

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).

A flaw was found in Bouncy Castle for Java, a cryptographic library. An attacker can exploit this vulnerability by manipulating rfc822Name and URI fields within X.509 certificates using a trailing dot.

This bypasses Name Constraints, potentially leading to spoofing or unauthorized access. Such an exploit impacts the integrity and confidentiality of communications.

Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-295.

Affected Red Hat products: Red Hat Ceph Storage 9; Red Hat JBoss Enterprise Application Platform 7; Red Hat Single Sign-On 7. Red Hat lists Red Hat AMQ Clients; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.

Will not fix / out of support: Red Hat JBoss Enterprise Application Platform 7. Red Hat does not currently list a fixing RHSA for this CVE.

Affected versions

< 1.85
< 2.73.12
< 1.0.2.7
< 1.0.X
< 2.0.2
< 2.0.X
< 2.1.3
< 2.1.X

Official advisory · high-confidence parse· fetched 24 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 24 days ago·verify at source

Mitigation

The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.

Official advisory · high-confidence parse· fetched 24 days ago·verify at source

Discussion(0)

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