CVE-2026-46600: Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage

High severity · published Jul 21, 2026

CVE-2026-46600

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

7.5

CVSS

0.5%

EPSS

On KEV

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.5% · higher than 46% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

golang.org/x/net/dns/dnsmessage · golang.org/x/net

before 0.56.0 · source: vendor

net · Go standard library

1.26.0-0 before 1.26.6; 1.27.0-0 before 1.27.0-rc.3 · source: vendor

Affected product

net

Go standard library

All net CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-46600

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-46600

go.dev

https://go.dev/cl/786345

go.dev

https://go.dev/issue/79795

groups.google.com

https://groups.google.com/g/golang-announce/c/94pEornpRlI

pkg.go.dev

https://pkg.go.dev/vuln/GO-2026-5942