CVE-2026-33811
high
CVSS v3
7.5
CVSS v2
—
VIR risk
7.5
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.
Predictions
Exploit likelihood
83%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-33811.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-33811
Vendor advisory: security@golang.org — https://pkg.go.dev/vuln/GO-2026-4981
Vendor advisory: security@golang.org — https://go.dev/cl/767860
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | trixie | affected | |
| debian | bullseye | affected | |
| debian | bookworm | affected | |
| debian | forky | fixed | 1.25.10-1 |
| debian | sid | fixed | 1.25.10-1 |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | stdlib | >=1.26.0-0,<1.26.3 | 1.25.10 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| golang | go | {"endExcluding":"1.25.10"} | 1.25.10 |
References
CWEs
CWE-415
Verify integrity in audit chain (admin only). AS-IS.