Vulnerability Details CVE-2026-59843
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 41.1%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-59843
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cpe:2.3:a:libssh:libssh:-
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cpe:2.3:a:redhat:hardened_images:-
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cpe:2.3:o:redhat:enterprise_linux:10.0
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cpe:2.3:o:redhat:enterprise_linux:8.0
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cpe:2.3:o:redhat:enterprise_linux:9.0