CVE-2026-33810

Name: CVE-2026-33810
Creator: NVD / NIST
Published: 2026-04-08T02:16:03.95+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2026-33810 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.2/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS Probability

0.26%

17.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Golang	Go	>= 1.26.0, < 1.26.2

References

https://go.dev/cl/763763Patch
https://go.dev/issue/78332Issue Tracking
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWUMailing List, Release Notes
https://pkg.go.dev/vuln/GO-2026-4866Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/19/4
http://www.openwall.com/lists/oss-security/2026/04/20/1

Timeline

Published: Apr 8, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-33810?

How severe is CVE-2026-33810?

CVE-2026-33810 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33810?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33810?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST