Vulnerability · Published Jul 21, 2026 · Assigned by Go
CVE-2026-46600Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage
High 7.5
In plain English
A high-severity out-of-bounds read in net from Go standard library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 53.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | go | 1.26.8-r0 | ALPINE-CVE-2026-46600 |
| Debian:14 | golang-golang-x-net | 1:0.56.0-1 | DEBIAN-CVE-2026-46600 |
| Go | golang.org/x/net | 0.56.0 | GO-2026-5942 |
| Go | stdlib | 1.26.6, 1.27.0-rc.3 | GO-2026-5942 |
| Ubuntu:22.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-46600 |
| Ubuntu:24.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-46600 |
| Ubuntu:26.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-46600 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | net | 1.26.0-0 – before 1.26.61.27.0-0 – before 1.27.0-rc.3 |
| golang.org/x/net | golang.org/x/net/dns/dnsmessage | 0 – before 0.56.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H