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: 2026-07-02 13:02 UTC (History)
137 users (show)

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

Attachments (Terms of Use)


Links
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
Red Hat Product Errata RHSA-2026:19135 0 None None None 2026-05-19 16:07:40 UTC
Red Hat Product Errata RHSA-2026:19144 0 None None None 2026-05-19 16:09:14 UTC
Red Hat Product Errata RHSA-2026:19353 0 None None None 2026-05-19 21:39:22 UTC
Red Hat Product Errata RHSA-2026:19719 0 None None None 2026-05-20 16:41:13 UTC
Red Hat Product Errata RHSA-2026:19720 0 None None None 2026-05-20 16:53:39 UTC
Red Hat Product Errata RHSA-2026:19721 0 None None None 2026-05-20 16:48:43 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
Comment 6 errata-xmlrpc 2026-05-19 16:07:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19135 https://access.redhat.com/errata/RHSA-2026:19135
Comment 7 errata-xmlrpc 2026-05-19 16:09:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19144 https://access.redhat.com/errata/RHSA-2026:19144
Comment 8 errata-xmlrpc 2026-05-19 21:39:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19353 https://access.redhat.com/errata/RHSA-2026:19353
Comment 9 errata-xmlrpc 2026-05-20 16:41:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:19719 https://access.redhat.com/errata/RHSA-2026:19719
Comment 10 errata-xmlrpc 2026-05-20 16:48:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:19721 https://access.redhat.com/errata/RHSA-2026:19721
Comment 11 errata-xmlrpc 2026-05-20 16:53:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:19720 https://access.redhat.com/errata/RHSA-2026:19720
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