CVE-2026-3731
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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3Tags
Description
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.
Analysis
Out-of-bounds read in libssh versions up to 0.11.3 allows remote attackers to cause denial of service by manipulating the idx argument in the SFTP extension name handler functions. The vulnerability resides in the sftp_extensions_get_name and sftp_extensions_get_data functions, enabling unauthenticated attackers to trigger memory access violations without user interaction. …
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Remediation
Within 30 days: Identify affected systems running libssh and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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