CVE-2026-46600 Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage
Attackers can cause a panic and denial of service by sending malformed SVCB or HTTPS DNS records to applications using the Go DNS library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46600?
CVE-2026-46600 is a high-severity denial of service vulnerability in golang.org/x/net/dns/dnsmessage, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer.
Weakness: CWE-125
Which versions are affected by CVE-2026-46600?
3 open source packages ship an affected version, including golang, golang.org/x/net and stdlib.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | From 1.26.0 | 1.26.6 |
golang.org/x/net Go | All versions | 0.56.0 |
stdlib Go | From 1.26.0-0 | 1.26.6, 1.27.0-rc.3 |
How do I fix CVE-2026-46600?
Upgrade golang to 1.26.6 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-46600 being exploited?
There is no known exploitation of CVE-2026-46600 in the wild and no public exploit code.
Sources
Also known as AZL-93198, BELL-CVE-2026-46600, BIT-golang-2026-46600, CLEANSTART-2026-DA99673, CLEANSTART-2026-EJ80416, CLEANSTART-2026-GL92541 and 2032 more.