In short
- CVE-2026-33810 is a HIGH (CVSS 8.2) vulnerability affecting stdlib, go (golang).
- Chance of exploitation in the next 30 days (EPSS): 0.34%, higher than 27.5% of all vulnerabilities.
- Fix: update to 1.26.2 or later.
| Package | Affected versions | Patched versions |
|---|
| stdlib Go | ≥ 1.26.0-0, < 1.26.2
| 1.26.2
|
| go | ≥ 1.26.0, < 1.26.2
| 1.26.2
|
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.
NVD 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.
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