Bug 2456335 (CVE-2026-33810) - CVE-2026-33810 crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application
Summary: CVE-2026-33810 crypto/x509: golang: Go crypto/x509: Certificate validation by...
Keywords:
Status: NEW
Alias: CVE-2026-33810
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2456853
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-08 02:01 UTC by OSIDB Bzimport
Modified: 2026-05-12 13:08 UTC (History)
130 users (show)

Fixed In Version:
Clone Of:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:14391 0 None None None 2026-05-06 21:10:37 UTC

Description OSIDB Bzimport 2026-04-08 02:01:32 UTC 
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
Comment 4 errata-xmlrpc 2026-05-06 21:10:30 UTC 
This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:14391 https://access.redhat.com/errata/RHSA-2026:14391
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