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.
Advisories
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Mon, 09 Nov 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Hickory-dns
Hickory-dns hickory-dns |
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| Vendors & Products |
Hickory-dns
Hickory-dns hickory-dns |
Sun, 08 Nov 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-09T13:55:57.344Z
Reserved: 2026-11-06T00:53:14.313Z
Link: CVE-2026-123570
No data.
Status : Received
Published: 2026-11-08T02:16:49.830
Modified: 2026-11-09T14:17:11.710
Link: CVE-2026-123570
No data.
OpenCVE Enrichment
Updated: 2026-11-09T17:11:51Z
Weaknesses