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CVE-2026-33811

nvd nist
Published: May 7, 2026Modified: Jul 24, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 3.9 / Impact: 3.6
Source: NVD

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.

Affected (2)

Products: Golang: Go
Golang
1 product
Go
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Golang
Go
Before 1.25.10
Go
From 1.26.0 to 1.26.3

Related CWEs

CWE-1341
Multiple Releases of Same Resource or Handle
The product attempts to close or release a resource or handle more than once, without any successful open between the close operations.
CWE-415
Double Free
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.

References (60)

Source: security@golang.org
Patch
Source: security@golang.org
Issue Tracking
Source: security@golang.org
Mailing ListThird Party Advisory
Source: security@golang.org
Vendor Advisory
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Timeline

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