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CVE-2026-33811 High

Crash when handling long CNAME response in net

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Exploit probability 0.8%
Published May 7, 2026
Required by Not available
Last source change August 20, 2026

02 / AFFECTED SOFTWARE

Affected packages

Go stdlib
Bitnami golang
Unknown Unknown

152 explicit affected versions

03 / CONNECTIONS

Connected vulnerabilities

related RHSA-2026:54552
related OPENSUSE-SU-2026:21483-1

04 / EVIDENCE

Source records

Open Source Vulnerabilities GO-2026-4981

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

View original source
Open Source Vulnerabilities CVE-2026-33811

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

View original source
Open Source Vulnerabilities BIT-golang-2026-33811

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

View original source

05 / REFERENCES

Further evidence