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NVD Vulnerability Details :

CVE-2026-33810

Modified

Source-security@golang.org

Published At-08 Apr, 2026 | 02:16

Updated At-20 Apr, 2026 | 18:16

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Primary	3.1	8.2	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Secondary	3.1	7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Type: Primary

Version: 3.1

Base score: 8.2

Base severity: HIGH

Vector:

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

Type: Secondary

Version: 3.1

Base score: 7.5

Base severity: HIGH

Vector:

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

CPE Matches

>>go>>Versions from 1.26.0(inclusive) to 1.26.2(exclusive)

cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*

Weaknesses

CWE ID	Type	Source
CWE-295	Primary	nvd@nist.gov

CWE ID: CWE-295

Type: Primary

Source: nvd@nist.gov

References

Hyperlink	Source	Resource
https://go.dev/cl/763763	security@golang.org	Patch
https://go.dev/issue/78332	security@golang.org	Issue Tracking
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU	security@golang.org	Mailing List Release Notes
https://pkg.go.dev/vuln/GO-2026-4866	security@golang.org	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/19/4	af854a3a-2127-422b-91ae-364da2661108	N/A
http://www.openwall.com/lists/oss-security/2026/04/20/1	af854a3a-2127-422b-91ae-364da2661108	N/A