CVE-2026-33811

7.5 HIGH

Published: May 07, 2026 Modified: May 12, 2026

Description

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

0.0 Low Medium High Critical 10.0

Vector String

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

Patch Vendor Advisory Exploit Third Party Advisory

https://go.dev/cl/767860

Source: security@golang.org

Patch

https://go.dev/issue/78803

Source: security@golang.org

Issue Tracking

Source: security@golang.org

Mailing List Third Party Advisory

Source: security@golang.org

Vendor Advisory

4 reference(s) from NVD

CVSS v3 Score

7.5 / 10.0

EPSS (Exploit Probability)

0.5%

39th percentile

Exploitation Status

Not in CISA KEV

CWE-415

golang