CVE-2025-59029 Internal logic flaw in cache management can lead to a denial of service in PowerDNS Recursor
An attacker can cause a denial of service in PowerDNS Recursor by triggering an assertion failure through crafted DNS record requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59029?
CVE-2025-59029 is a medium-severity denial of service vulnerability in Powerdns Recursor, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An attacker can trigger an assertion failure by requesting crafted DNS records, waiting for them to be inserted into the records cache, then send a query with qtype set to ANY.
Weakness: CWE-617
Which versions are affected by CVE-2025-59029?
It affects 1 product.
Products include Powerdns Recursor.
How do I fix CVE-2025-59029?
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-2025-59029 being exploited?
There is no known exploitation of CVE-2025-59029 in the wild and no public exploit code.
Other vulnerabilities in Powerdns Recursor
- CVE-2009-4009 Memory corruption in n/a
- CVE-2020-10030 Memory corruption in n/a
- CVE-2025-59023 Crafted delegations or IP fragments can poison cached delegations in Recursor
- CVE-2025-59030 Insufficient validation of incoming notifies over TCP can lead to a denial of service in Recursor
- CVE-2023-22617 Denial of service in n/a
Sources
Also known as DEBIAN-CVE-2025-59029, GHSA-2gr2-cm9q-vr3v, UBUNTU-CVE-2025-59029.