Bug 2533157 - CVE-2026-59638 bouncycastle: Bouncy Castle for Java: Improper hostname validation due to default CN-fallback in JSSE verifier [fedora-all]
Summary: CVE-2026-59638 bouncycastle: Bouncy Castle for Java: Improper hostname valida...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: bouncycastle
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Mat Booth
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["3e62adc7-4596-4a0d-acea-3...
Depends On:
Blocks: CVE-2026-59638
TreeView+ depends on / blocked
 
Reported: 2026-09-14 15:52 UTC by Joel Chamberlain
Modified: 2026-09-14 15:52 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:

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Description Joel Chamberlain 2026-09-14 15:52:33 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).
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