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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Go standard library | crypto/x509 | unaffected |
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Advisories
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Fixes
Solution
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Workaround
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References
History
Wed, 08 Apr 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509 | |
| References |
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Projects
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MITRE
Status: PUBLISHED
Assigner: Go
Published:
Updated: 2026-04-08T01:06:56.546Z
Reserved: 2026-03-23T20:35:32.814Z
Link: CVE-2026-33810
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-04-08T02:16:03.950
Modified: 2026-04-08T02:16:03.950
Link: CVE-2026-33810
Redhat
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OpenCVE Enrichment
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Weaknesses
No weakness.