CVE-2026-33811

HIGH

Crash when handling long CNAME response in net

Title source: cna
STIX 2.1

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.

References (31)

Core 31
Core References

Scores

CVSS v3 7.5
EPSS 0.0081
EPSS Percentile 52.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-1341 CWE-415
Status published
Products (3)
Go standard library/net < 1.25.10
Go standard library/net 1.26.0-0 - 1.26.3
golang/go < 1.25.10
Published May 07, 2026
Tracked Since May 08, 2026