Name: CVE-2026-3731: Out-of-bounds Read
Creator: Rapid7
Published: 2026-03-08T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-3731, CVSS 5.3, EPSS 0.00724

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.

CVSS Details

CVSS 4.0 Base Score: 6.9 (MEDIUM)
CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 5.3
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Amazon_linux_2023	—	Upgrade libsshUpgrade libssh-configUpgrade libssh-debuginfoUpgrade libssh-develUpgrade libssh-debugsource	Jun 9, 2026	Mar 8, 2026
Debian	—	Upgrade libssh	Aug 3, 2026	Aug 3, 2026
Redhat_linux	—	No solution exists	Jul 17, 2026	Mar 8, 2026
Suse	—	Upgrade libssh4Upgrade libssh-configUpgrade libssh-devel-docUpgrade libssh-develUpgrade libssh4-32bit	Apr 15, 2026	Mar 20, 2026
Ubuntu	—	Upgrade libssh-gcrypt-4 (Ubuntu Pro)Upgrade libssh-4Upgrade libssh-4 (Ubuntu Pro)Upgrade libssh-gcrypt-4	Mar 18, 2026	Mar 8, 2026

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CVSS Details

Covered by Rapid7

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