CVE-2026-33594: PowerDNS DNSdist · Unthrottled Resource Allocation
Affects PowerDNS DNSdistSource CVE Database V5
Not known to be exploited · CVSS 5.3 Medium : upgrade to 2.0.4 or 1.9.13 when convenient.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2.0.4, 1.9.13
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade DNSdist and dnsdist to 2.0.4 or 1.9.13.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PowerDNSDNSdist | Affected
| Fixed in
|
| PowerDNSDNSdist | Affected
| Fixed in
|
GitHubdnsdistpkg:github/dnsdistOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
If you cannot patch yet, consider limiting query rates or implementing external rate limiting to reduce the risk of resource exhaustion. Monitor backend DoH service load to avoid overload conditions that trigger the vulnerability.
Description
A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.