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VulnerabilityPublished

CVE-2026-33595: PowerDNS DNSdist · Unthrottled Resource Allocation

Affects PowerDNS DNSdistSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 2.0.4 or 1.9.13 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

Upgrade DNSdist and dnsdist to 2.0.4 or 1.9.13.

Affected software

ProductAffectedFixed in
PowerDNSDNSdistAffected
  • >=2.0.0 <2.0.4
Fixed in
  • 2.0.4
PowerDNSDNSdistAffected
  • >=1.9.0 <1.9.13
Fixed in
  • 1.9.13
GitHubdnsdistpkg:github/dnsdistOther threatsAffected
  • >=1.9.0 <1.9.13
  • >=2.0.0 <2.0.4
Fixed in
  • 1.9.13
  • 2.0.4

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 the number of simultaneous DoQ and DoH3 connections or implementing external rate limiting to reduce the risk of resource exhaustion.

Description

A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.

References

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