Description
The DNS packet parser in YADIFA before 2.2.6 does not check for the presence of infinite pointer loops, and thus it is possible to force it to enter an infinite loop. This can cause high CPU usage and makes the server unresponsive.
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 | yadifa | 2.2.6-1 | — |
| Debian 13 | yadifa | 2.2.6-1 | — |
| Debian 12 | yadifa | 2.2.6-1 | — |
| Debian 9 | yadifa | 2.2.3-1+deb9u1 | DSA-4001-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | yadifa | No fix yet | — |
Advisories 1
- DSA-4001-1 yadifa - security update Debian Security (DSA / DLA) · Mar 9, 2026