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://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

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