CVE-2026-33811

EUVD-2026-28419
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Debian logo
Debian Releases
Debian Product
Codename
golang-1.15
bullseye
vulnerable
golang-1.19
bookworm
vulnerable
golang-1.24
trixie
vulnerable
golang-1.25
forky
vulnerable
sid
1.25.10-1
fixed
golang-1.26
forky
vulnerable
sid
1.26.3-1
fixed
Vulnerability Media Exposure
References
https://go.dev/cl/767860
https://go.dev/issue/78803
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
https://pkg.go.dev/vuln/GO-2026-4981