CVE-2026-42389 PUBLISHED

Reject more queries with invalid header values

Assigner: OX
Reserved: 27.04.2026 Published: 25.06.2026 Updated: 25.06.2026

This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS Score: 5.3

Product Status

Vendor PowerDNS
Product Recursor
Versions Default: unaffected
  • affected from 5.4.0 to 5.4.3 (excl.)

Credits

  • Xiang Li, Mingming Zhang, Fasheng Miao, Zuyao Xu from AOSP Lab, Nankai University, Zhongguancun Lab, Tsinghua University finder

References

Problem Types

  • Improper Input Validation CWE