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Bug 897928 (CVE-2023-26249)

Summary: <net-dns/knot-resolver-5.6.0: DoS via many TCP connections
Product: Gentoo Security Reporter: John Helmert III <ajak>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: CONFIRMED ---    
Severity: minor CC: matthew
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: B3 [glsa?]
Package list:
Runtime testing required: ---
Bug Depends on: 898036    
Bug Blocks:    

Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2023-02-26 17:49:39 UTC

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.

Please stabilize 5.6.0.
Comment 1 Larry the Git Cow gentoo-dev 2023-02-27 18:22:34 UTC
The bug has been referenced in the following commit(s):

commit 1175a164201bad5751040ae5d4a008a31a783332
Author:     Matthew Smith <>
AuthorDate: 2023-02-27 18:22:19 +0000
Commit:     Matthew Smith <>
CommitDate: 2023-02-27 18:22:19 +0000

    net-dns/knot-resolver: drop 5.5.3
    Signed-off-by: Matthew Smith <>

 net-dns/knot-resolver/Manifest                   |  2 -
 net-dns/knot-resolver/knot-resolver-5.5.3.ebuild | 93 ------------------------
 2 files changed, 95 deletions(-)