CVE-2026-46600: Go Standard Library Net

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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

Affected products

• Go Standard Library Net: from 1.26.0-0, before 1.26.6 (fixed in 1.26.6); from 1.27.0-0, before 1.27.0-rc.3 (fixed in 1.27.0-rc.3)
• Golang.org/x/net Golang.org/x/net/dns/dnsmessage: before 0.56.0 (fixed in 0.56.0)

Published 2026-07-21. Last modified 2026-08-14.