5.3

CVE-2026-40012: powerdns recursor

CVSS: 5.3v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-40012DEBIAN-CVE-2026-40012
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-40012 is a medium (CVSS 5.3) vulnerability in powerdns recursor. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 38.2% 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
0.45%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-06-2026
    PublishedVulnerability first disclosed.
  2. 25-06-2026
    Last modifiedVulnerability information updated.

Description

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

+0.13 pp

From 0.32% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.45%

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) | < 5.2.11-0+deb13u1 | < 5.4.3-1
Powerdns1 product
  • recursor≥ 5.2.0, < 5.2.11 | ≥ 5.3.0, < 5.3.8 | ≥ 5.4.0, < 5.4.3
Ubuntu1 product
  • pdns-recursorAll versions (No fix recorded)

3 vendors · 3 products

References

5 links