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.

Affected Platforms

Weakness Type

CWE-415, CWE-1341

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
• https://access.redhat.com/errata/RHSA-2026:23262
• https://access.redhat.com/errata/RHSA-2026:23264