GO-2026-4866
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
At a glance
- Published
- Updated
- CVE
- CVE-2026-33810
- Aliases
- BIT-golang-2026-33810
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.
Affected packages
| Package | Versions |
|---|---|
| Go · stdlib | introduced 1.26.0-0, fixed 1.26.2 |
References
- https://go.dev/cl/763763 FIX
- https://go.dev/issue/78332 REPORT
- https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — Go Vulnerability Database |