CVE-2026-46600

Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage

State: Published
Severity: 7.5 High
Published: Jul 21, 2026
Updated: Aug 14, 2026
Reserved: May 15, 2026

Description

Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
netGo standard library	1.26.0-0 to before 1.26.6Affected 1.27.0-0 to before 1.27.0-rc.3Affected
golang.org/x/net/dns/dnsmessagegolang.org/x/net	before 0.56.0Affected

References

https://go.dev/cl/786345
https://go.dev/issue/79795
https://groups.google.com/g/golang-announce/c/94pEornpRlI
https://pkg.go.dev/vuln/GO-2026-5942

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