3.7

CVE-2026-40208: powerdns dnsdist Incorrect Control Flow Scoping

CVSS: 3.7v3.1LowDeferred
AliasesUBUNTU-CVE-2026-40208DEBIAN-CVE-2026-40208
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-40208 is a low (CVSS 3.7) Incorrect Control Flow Scoping vulnerability in powerdns dnsdist. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.9% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.20 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2026:11411-1OPENSUSE-SU-2026:21533-1SUSE-SU-2026:23123-1SUSE-SU-2026:23146-1

Timeline

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

Description

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.20 pp

From 0.21% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.40%

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) | < 1.9.15-0+deb13u1 | < 2.1.0-1
Powerdns1 product
  • dnsdist≥ 1.9.0, < 1.9.15 | ≥ 2.0.0, < 2.0.7
Ubuntu1 product
  • dnsdistAll versions (No fix recorded)

3 vendors · 3 products

References

5 links