Memory Corruption Vulnerability in Go DNS Resolver by Google
CVE-2026-33811

Currently unrated

Key Information:

Vendor: Go Standard Library
Status: Net
Vendor: CVE Published:; 7 May 2026

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What is CVE-2026-33811?

A vulnerability exists in the Go DNS resolver when utilizing LookupCNAME, wherein an excessively lengthy CNAME response can lead to a double-free of C memory, resulting in potential application crashes. This flaw underscores the importance of proper memory management in network operations, as it could disrupt service availability and create security risks.

Affected Version(s)

net 0 < 1.25.10

net 1.26.0-0 < 1.26.3

References

https://go.dev/issue/78803

https://go.dev/cl/767860

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

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Timeline

Vulnerability published
May 7, 2026
Vulnerability Reserved
Mar 23, 2026

Credit

hamayanhamayan

CVE-2026-33811 Data

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