CVE-2026-123575
Received Received - Intake

Hickory DNS DoH HTTP/2 Resource Exhaustion

Publication date: 2026-11-08

Last updated on: 2026-11-08

Assigner: VulnCheck

Description
Hickory DNS before 0.26.2 contains a resource exhaustion vulnerability in its DNS-over-HTTPS HTTP/2 server that lacks sufficient timeouts or limits for incomplete request bodies. Remote attackers can open DoH connections, send incomplete request bodies, and hold connections open to exhaust server memory.

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Meta Information

Published
2026-11-08
Last Modified
2026-11-08
Generated
2026-11-08
AI Q&A
2026-11-08
EPSS Evaluated
N/A
NVD
CVE-2026-123575
EUVD
EUVD-2026-119334

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
hickory dns to 0.26.2 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

Hickory DNS before 0.26.2 has a resource exhaustion vulnerability in its DNS-over-HTTPS HTTP/2 server. The server lacks sufficient timeouts or limits for incomplete request bodies, allowing remote attackers to open DoH connections, send incomplete requests, and hold connections open to exhaust server memory.

Impact Analysis

This vulnerability can cause denial-of-service by consuming server resources, leading to degraded performance or complete service outages for DNS-over-HTTPS users.

Mitigation Strategies

Upgrade Hickory DNS to version 0.26.2 or later to address the resource exhaustion vulnerability in the DNS-over-HTTPS HTTP/2 server.

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