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Name
CVE-2026-33811
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.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://go.dev/issue/78803Issue Tracking
https://pkg.go.dev/vuln/GO-2026-4981Vendor Advisory
Analysis#
Vulnerability Ratings#
7.5
CVSSv31
7.5
CVSSv31
NaN
other
Others affected components#
Name
Project
Project Version
Version
Status
openwrt
master
1.24.13-r1
Exploitable
openwrt
master
1.26.4-r1
Not Affected
openwrt
openwrt-25.12
1.24.13-r1
Exploitable
openwrt
openwrt-25.12
1.26.4-r1
Not Affected
yocto
master
1.26.4
Not Affected
yocto
master
1.26.4
Not Affected
yocto
scarthgap
1.22.12
Patched
yocto
scarthgap
1.22.12
Exploitable
Resolved with patches#
go (yocto:scarthgap)
#
Title
Author
Resolve
1
net: avoid double-free of cgo pointer when handling large DNS
Damien Neil <dneil@google.com>
CVE-2026-33811