Bug 2568817 (CVE-2026-123570) - CVE-2026-123570 hickory-proto: hickory-proto: Denial of Service via excessive memory allocation in DNS parser
Summary: CVE-2026-123570 hickory-proto: hickory-proto: Denial of Service via excessive...
Keywords:
Status: NEW
Alias: CVE-2026-123570
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
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 03:21 UTC (History)
15 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-08 02:06:29 UTC 
The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.
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