CVE-2026-33810

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Source
https://cve.org/CVERecord?id=CVE-2026-33810
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33810.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-33810
Aliases
Downstream
Related
Published
2026-04-08T01:06:56.546Z
Modified
2026-05-13T07:34:26.981940440Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
Details

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.

Database specific 
{
    "cna_assigner": "Go",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33810.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "1.26.0-0"
                },
                {
                    "fixed": "1.26.2"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/golang/go

Affected ranges

Type
GIT
Repo
https://github.com/golang/go
Events
Introduced
d90b98e65320778f3b1f99a6951ab20f04d218b3
Fixed
9c8bf0e72a6fb3b415b591b124b59fbb7cf92252
Database specific 
{
    "source": "CPE_FIELD",
    "cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.26.0"
        },
        {
            "fixed": "1.26.2"
        }
    ]
}

Affected versions

go1.*
go1.26.0
go1.26.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33810.json"