Bug 2568804 (CVE-2026-123578) - CVE-2026-123578 hickory-net: hickory-proto: Hickory DNS: DNS spoofing defense bypass via empty question section
Summary: CVE-2026-123578 hickory-net: hickory-proto: Hickory DNS: DNS spoofing defense...
Keywords:
Status: NEW
Alias: CVE-2026-123578
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:06 UTC by OSIDB Bzimport
Modified: 2026-11-08 03:17 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-11-08 02:06:16 UTC 
Hickory DNS hickory-net 0.26.0 before 0.26.2 and hickory-proto 0.25.0 through 0.25.2 skip the check that a UDP response's question section matches the query when the response has an empty question section (QDCOUNT=0), and also skip the case-randomization check. Remote attackers able to inject spoofed UDP responses can send QDCOUNT=0 responses to bypass these checks, weakening defenses against DNS spoofing.
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