5.9

CVE-2026-33261: powerdns recursor Missing Support for Integrity Check

CVSS: 5.9v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-33261DEBIAN-CVE-2026-33261
Published 22-04-2026Last modified 22-04-2026
Open JSON

Vulnerability summary

CVE-2026-33261 is a medium (CVSS 5.9) Missing Support for Integrity Check vulnerability in powerdns recursor. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.3% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

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

Description

A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.01 pp

From 0.23% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.24%

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
  • pdns-recursorAll versions (No fix recorded) | < 5.2.9-0+deb13u1 | < 5.4.1-1
Powerdns1 product
  • recursor≥ 5.4.0, < 5.4.1 | ≥ 5.2.0, < 5.2.9 | ≥ 5.3.0, < 5.3.6 | 5.4.0
Ubuntu1 product
  • pdns-recursorAll versions (No fix recorded)

3 vendors · 3 products

References

5 links