High severity7.5NVD Advisory· Published Feb 21, 2023· Updated Jun 17, 2026
CVE-2023-26249
CVE-2023-26249
Description
Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.
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Affected products
2- Knot Labs/Knot Resolverdescription
- Range: <5.6.0
Patches
Vulnerability mechanics
References
1- www.knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.htmlnvdRelease NotesVendor Advisory
News mentions
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