Description
Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | knot-resolver | 5.7.0-1 | — |
| Debian 13 | knot-resolver | 5.7.0-1 | — |
| Debian 12 | knot-resolver | 5.6.0-1+deb12u1 | DSA-5633-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | knot-resolver | No fix yet | — |
| Ubuntu 20.04 LTS | knot-resolver | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | knot-resolver | No fix yet | — |
| Ubuntu Pro 18.04 LTS | knot-resolver | No fix yet | — |
| Ubuntu Pro 16.04 LTS | knot-resolver | No fix yet | — |
Advisories 1
- DSA-5633-1 knot-resolver - security update Debian Security (DSA / DLA) · Mar 9, 2026