Vulnerability DatabaseCVE-2026-59843
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CVE-2026-59843
Published:July 21, 2026
Updated:August 04, 2026
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.
Affected Packages
https://gitlab.com/libssh/libssh-mirror.git (SCM_GIT):
Affected version(s) >=libssh-0.8.0 <libssh-0.11.5
Fix Suggestion:
Update to version libssh-0.11.5
https://gitlab.com/libssh/libssh-mirror.git (SCM_GIT):
Affected version(s) =libssh-0.12.0 <libssh-0.12.1
Fix Suggestion:
Update to version libssh-0.12.1
Related Resources (3)
https://bugzilla.redhat.com/show_bug.cgi?id=2498176
https://access.redhat.com/security/cve/CVE-2026-59843
https://access.redhat.com/errata/RHSA-2026:42922
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400
EPSS
Base Score:
0.51