Detections
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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

https://security-tracker.debian.org/tracker/CVE-2026-3731

Plugin Details

Severity: Medium

ID: 301503

File Name: unpatched_CVE_2026_3731.nasl

Version: 1.10

Type: local

Agent: unix

Family: Misc.

Published: 3/9/2026

Updated: 3/29/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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: High

Base Score: 7.5

Temporal Score: 6.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:libssh-config, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:libssh, p-cpe:/a:centos:centos:libssh2-devel, cpe:/o:debian:debian_linux:12.0, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:libssh2-docs, p-cpe:/a:debian:debian_linux:libssh, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:libssh, p-cpe:/a:redhat:enterprise_linux:libssh-config, p-cpe:/a:centos:centos:libssh2-docs, p-cpe:/a:centos:centos:libssh-devel, p-cpe:/a:centos:centos:libssh2, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:redhat:enterprise_linux:libssh2, cpe:/o:centos:centos:7, p-cpe:/a:redhat:enterprise_linux:libssh2-devel, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:libssh-devel

Required KB Items: Host/cpu, Host/local_checks_enabled, 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