CVE-2026-42389
Reject more queries with invalid header values
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
| Vendor | powerdns |
| Product | recursor |
| Published | Jun 25, 2026 |
| Last Updated | Jun 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
PowerDNS / Recursor
5.4.0 < 5.4.3
References
Credits
Xiang Li, Mingming Zhang, Fasheng Miao, Zuyao Xu from AOSP Lab, Nankai University, Zhongguancun Lab, Tsinghua University