Description
PowerDNS before 2.9.18, when allowing recursion to a restricted range of IP addresses, does not properly handle questions from clients that are denied recursion, which could cause a "blank out" of answers to those clients that are allowed to use recursion.
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 | 2.9.18-1 | — |
| Debian 13 | pdns | 2.9.18-1 | — |
| Debian 12 | pdns | 2.9.18-1 | — |
| Debian 3.1 | pdns | 2.9.17-13sarge1 | DSA-771-1 |
Advisories 1
- DSA-771-1 pdns - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://doc.powerdns.com/changelog.html#CHANGELOG-2-9-18
- SUSE-SR:2005:019 vendor-advisory
- 20050716 PowerDNS 2.9.18 fixes two security issues affecting users of LDAP mailing-list
- 1014504 vdb-entry