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Security Advisories

GO-2026-4981

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

Severity

7.5

High

CVSS V3

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Summary

Crash when handling long CNAME response in net

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.

  • https://nvd.nist.gov/vuln/detail/CVE-2026-33811
  • https://github.com/advisories/GHSA-497x-jcxf-m478
  • https://pkg.go.dev/vuln/GO-2026-4981
  • https://go.dev/issue/78803
  • https://go.dev/cl/767860
  • https://groups.google.com/g/golang-announce/c/qcCIEXso47M

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