Vulnerability in Golang Go
CVE-2026-33810
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 cert…
Vulnerability class: Improper Certificate Validation
EPSS: 0.003 (26.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Golang Go
- Go Standard Library Crypto/x509 — versions 1.26.0-0
Weakness classification (CWE)
References
- security@golang.org (Patch)
- security@golang.org (Issue Tracking)
- security@golang.org (Mailing List, Release Notes)
- security@golang.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-33810?
- CVE-2026-33810 is a high-severity vulnerability in Golang Go, classified under Improper Certificate Validation. CVSS score: 8.2/10. Published 2026-04-08.
- How severe is CVE-2026-33810?
- High severity. CVSS v3 base score is 8.2 out of 10.