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CVE-2026-33810

HIGH

8.2

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.

CVE Details

CVSS v3.1 Score8.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/8/2026

Last Modified4/20/2026

Sourcenvd

Honeypot Sightings0

Affected Products

golang:go

Weaknesses (CWE)

CWE-295

References

https://go.dev/cl/763763(security@golang.org)

https://go.dev/issue/78332(security@golang.org)

https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU(security@golang.org)

https://pkg.go.dev/vuln/GO-2026-4866(security@golang.org)

http://www.openwall.com/lists/oss-security/2026/04/19/4(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/04/20/1(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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