8.1

CVE-2026-33599: powerdns dnsdist Out-of-bounds Read

CVSS: 8.1v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-33599DEBIAN-CVE-2026-33599
Published 22-04-2026Last modified 22-04-2026
Open JSON

Vulnerability summary

CVE-2026-33599 is a high (CVSS 8.1) Out-of-bounds Read vulnerability in powerdns dnsdist. EPSS estimates a 0.80% chance of exploitation in the next 30 days, higher than 56.1% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.80%
0%100%
Low · +0.52 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:10632-1OPENSUSE-SU-2026:21015-1SUSE-SU-2026:22319-1

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 22-04-2026
    Last modifiedVulnerability information updated.

Description

A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.80%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

+0.52 pp

From 0.28% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.80%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • dnsdistAll versions (No fix recorded) | < 1.9.14-0+deb13u1 | < 2.0.4-1
Powerdns1 product
  • dnsdist≥ 1.9.0, < 1.9.13 | ≥ 2.0.0, < 2.0.4
Ubuntu1 product
  • dnsdistAll versions (No fix recorded)

3 vendors · 3 products

References

5 links