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Vulnerabilities CVE-2026-59843

CVE-2026-59843

Medium
Open
TLP:CLEAR

Libssh: libssh: denial of service via zero advertised channel packet size

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Description

A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.

Details

CVSS Score
6.5
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 21, 2026
Last Modified
Aug 12, 2026
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