5.3

CVE-2026-0398: powerdns recursor

CVSS: 5.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-0398DEBIAN-CVE-2026-0398
Published 09-02-2026Last modified 09-02-2026
Open JSON

Vulnerability summary

CVE-2026-0398 is a medium (CVSS 5.3) vulnerability in powerdns recursor. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 26.6% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.34%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DSA-6134-1

Timeline

  1. 09-02-2026
    PublishedVulnerability first disclosed.
  2. 09-02-2026
    Last modifiedVulnerability information updated.

Description

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

+0.03 pp

From 0.32% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.34%

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) | < 5.2.8-0+deb13u1 | < 5.3.5-1
Powerdns1 product
  • recursor≥ 5.2.0, < 5.2.8 | ≥ 5.1.0, < 5.1.10 | ≥ 5.2.8, < 5.2.8 | ≥ 5.3.0, < 5.3.5
Ubuntu1 product
  • pdns-recursorAll versions (No fix recorded)

3 vendors · 3 products

References

5 links