Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2026-3731
medium Nessus Plugin ID 301503
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Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- 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.
(CVE-2026-3731)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-3731
Plugin Details
Severity: Medium
ID: 301503
File Name: unpatched_CVE_2026_3731.nasl
Version: 1.3
Type: local
Agent: unix
Family: Misc.
Published: 3/9/2026
Updated: 3/10/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 4.3
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2026-3731
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 9
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6.9
Threat Score: 2.7
Threat Vector: CVSS:4.0/E:U
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
Vulnerability Information
CPE: p-cpe:/a:debian:debian_linux:libssh, p-cpe:/a:centos:centos:libssh2-docs, cpe:/o:debian:debian_linux:11.0, cpe:/o:centos:centos:8, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:centos:centos:7, p-cpe:/a:redhat:enterprise_linux:libssh-devel, p-cpe:/a:centos:centos:libssh2-devel, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:redhat:enterprise_linux:libssh-config, p-cpe:/a:redhat:enterprise_linux:libssh2, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:libssh2-docs, p-cpe:/a:redhat:enterprise_linux:libssh2-devel, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:libssh, p-cpe:/a:centos:centos:libssh2, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:libssh-config, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:libssh-devel, p-cpe:/a:redhat:enterprise_linux:libssh, p-cpe:/a:canonical:ubuntu_linux:libssh, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:redhat:enterprise_linux:6, cpe:/o:debian:debian_linux:12.0
Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Ease: No known exploits are available
Vulnerability Publication Date: 3/8/2026
Reference Information
CVE: CVE-2026-3731