CVE-2026-3119 Authenticated query containing a TKEY record may cause named to terminate unexpectedly
An authenticated attacker with a valid TSIG key can cause the BIND DNS server to crash by sending a query with a TKEY record.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3119?
CVE-2026-3119 is a medium-severity denial of service vulnerability in Isc Bind, published on 25 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Under certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the `named` configuration. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
Weakness: CWE-617
Which versions are affected by CVE-2026-3119?
It affects 1 product.
Products include Isc Bind.
How do I fix CVE-2026-3119?
Apply the vendor's patch.
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-2026-3119 being exploited?
There is no known exploitation of CVE-2026-3119 in the wild and no public exploit code.
Other vulnerabilities in Isc Bind
Sources
Also known as ALPINE-CVE-2026-3119, AZL-80984, BELL-CVE-2026-3119, DEBIAN-CVE-2026-3119, GHSA-rrrp-782c-4484, MINI-fggx-64h4-77w3 and 1 more.