CVE-2026-33810

Description

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33810.json

https://pkg.go.dev/vuln/GO-2026-4866

https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

https://go.dev/issue/78332

https://go.dev/cl/763763

https://bugzilla.redhat.com/show_bug.cgi?id=2456335

https://access.redhat.com/security/cve/CVE-2026-33810

https://access.redhat.com/errata/RHSA-2026:9385

https://access.redhat.com/errata/RHSA-2026:7291

https://access.redhat.com/errata/RHSA-2026:36796

https://access.redhat.com/errata/RHSA-2026:36651

https://access.redhat.com/errata/RHSA-2026:34365

https://access.redhat.com/errata/RHSA-2026:29854

https://access.redhat.com/errata/RHSA-2026:28047

https://access.redhat.com/errata/RHSA-2026:26585

https://access.redhat.com/errata/RHSA-2026:26571

https://access.redhat.com/errata/RHSA-2026:26568

https://access.redhat.com/errata/RHSA-2026:25089

https://access.redhat.com/errata/RHSA-2026:24478

https://access.redhat.com/errata/RHSA-2026:23345

https://access.redhat.com/errata/RHSA-2026:22962

https://access.redhat.com/errata/RHSA-2026:22961

https://access.redhat.com/errata/RHSA-2026:22960

https://access.redhat.com/errata/RHSA-2026:22959

https://access.redhat.com/errata/RHSA-2026:22958

https://access.redhat.com/errata/RHSA-2026:22862

https://access.redhat.com/errata/RHSA-2026:22485

https://access.redhat.com/errata/RHSA-2026:22347

https://access.redhat.com/errata/RHSA-2026:21772

https://access.redhat.com/errata/RHSA-2026:21769

https://access.redhat.com/errata/RHSA-2026:19721

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

https://access.redhat.com/errata/RHSA-2026:19719

https://access.redhat.com/errata/RHSA-2026:19353

https://access.redhat.com/errata/RHSA-2026:19144

https://access.redhat.com/errata/RHSA-2026:19135

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

https://access.redhat.com/errata/RHSA-2026:13545

https://access.redhat.com/errata/RHSA-2026:10158

https://access.redhat.com/errata/RHSA-2026:10155

http://www.openwall.com/lists/oss-security/2026/04/20/1

http://www.openwall.com/lists/oss-security/2026/04/19/4

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS