DEBIAN-CVE-2026-8763: bouncycastle security update

DEBIAN-CVE-2026-8763, released August 3, 2026, fixes 1 CVE in bouncycastle (version 1.86-1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.1

Base score, 0 to 10

Highest EPSS

0.0043

37th percentile

Fixed package versions

Product	Release	Fixed in
bouncycastle	Debian 14	1.86-1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-8763	bouncycastle: In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI	9.1	0.0043	None reported

Also fixes CVE-2026-8763

SUSE-SU-2026:3559-1
bouncycastle on sles 15.6, sles 15.7
SUSE-SU-2026:23150-1
bouncycastle on sles 16.0
OPENSUSE-SU-2026:21538-1
bouncycastle on opensuse-leap 16.0
ALAS2023-2026-2153
bouncycastle, bouncycastle-javadoc, bouncycastle-mail and 4 more on amzn 2023

Vendor advisory

https://security-tracker.debian.org/tracker/CVE-2026-8763

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