Bug 2568708 (CVE-2026-123604) - CVE-2026-123604 hickory-resolver: hickory-resolver: Denial of Service via unbounded retry loop
Summary: CVE-2026-123604 hickory-resolver: hickory-resolver: Denial of Service via unb...
Keywords:
Status: NEW
Alias: CVE-2026-123604
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:00 UTC by OSIDB Bzimport
Modified: 2026-11-08 02:00 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-11-08 02:00:24 UTC 
Hickory DNS hickory-resolver 0.26.0-beta.1 before 0.26.2 contains an unbounded retry loop in NameServerPool::try_send, which re-queues truncated (TC) responses without checking the answering transport or counting iterations. A malicious authoritative server returning TC=1 on every transport keeps the resolver spinning on a persistent TCP connection until the 5-second request deadline expires, causing resource exhaustion.
Note You need to log in before you can comment on or make changes to this bug.