CVE-2026-42389

Reject more queries with invalid header values

Published Jun 25, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Powerdns
Powerdns recursor
Vendors & Products Powerdns
Powerdns recursor
Type Values Removed Values Added
Weaknesses CWE-20
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
Title Reject more queries with invalid header values
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
OX
Published
Updated
Jun 25, 2026, 2:58 PM
Reserved
Apr 27, 2026, 8:53 AM
Status
Deferred
Published
Jun 25, 2026, 2:16 PM
Modified
Oct 25, 2026, 11:10 PM