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.

PUBLISHED Reserved 2026-03-23 | Published 2026-05-07 | Updated 2026-05-08 | Assigner Go

Problem types

CWE-415: Double Free

Product status

Credits

hamayanhamayan

References

go.dev/issue/78803

go.dev/cl/767860

groups.google.com/g/golang-announce/c/qcCIEXso47M

pkg.go.dev/vuln/GO-2026-4981

cve.org (CVE-2026-33811)

nvd.nist.gov (CVE-2026-33811)

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