3.7

CVE-2026-42004: powerdns dnsdist Misinterpretation of Input

CVSS: 3.7v3.1LowDeferred
AliasesUBUNTU-CVE-2026-42004DEBIAN-CVE-2026-42004
Published 25-06-2026Last modified 25-06-2026
Open JSON

Vulnerability summary

CVE-2026-42004 is a low (CVSS 3.7) Misinterpretation of Input vulnerability in powerdns dnsdist. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.3% 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
0.22%
0%100%
Low · +0.07 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 can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

+0.07 pp

From 0.16% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.22%

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