Description
The label decompression functionality in PowerDNS Recursor before 3.6.4 and 3.7.x before 3.7.3 and Authoritative (Auth) Server before 3.3.3 and 3.4.x before 3.4.5 allows remote attackers to cause a denial of service (CPU consumption or crash) via a request with a long name that refers to itself. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1868.
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 | pdns | 3.4.5-1 | — |
| Debian 14 | pdns-recursor | 3.7.3-1 | — |
| Debian 13 | pdns | 3.4.5-1 | — |
| Debian 13 | pdns-recursor | 3.7.3-1 | — |
| Debian 12 | pdns | 3.4.5-1 | — |
| Debian 12 | pdns-recursor | 3.7.3-1 | — |
| Debian 8 | pdns | 3.4.1-4+deb8u2 | DSA-3306-1 |
| Debian 8 | pdns-recursor | 3.6.2-2+deb8u2 | DSA-3307-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | pdns-recursor | 3.5.3-1ubuntu0.1 | — |
Advisories 2
- DSA-3306-1 pdns - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3307-1 pdns-recursor - security update Debian Security (DSA / DLA) · Mar 9, 2026