Linux Distros Unpatched Vulnerability : CVE-2026-107161

high Nessus Plugin ID 363959

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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 heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST- MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application. (CVE-2026-107161)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 363959

File Name: unpatched_CVE_2026_107161.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 10/7/2026

Updated: 10/19/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.51

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P

CVSS Score Source: CVE-2026-107161

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:cyrus-sasl2, p-cpe:/a:centos:centos:cyrus-sasl-devel, p-cpe:/a:centos:centos:cyrus-sasl-gs2, p-cpe:/a:centos:centos:cyrus-sasl-gssapi, p-cpe:/a:centos:centos:cyrus-sasl-ldap, p-cpe:/a:centos:centos:cyrus-sasl-lib, p-cpe:/a:centos:centos:cyrus-sasl-md5, p-cpe:/a:centos:centos:cyrus-sasl-ntlm, p-cpe:/a:centos:centos:cyrus-sasl-plain, p-cpe:/a:centos:centos:cyrus-sasl-scram, p-cpe:/a:centos:centos:cyrus-sasl-sql, p-cpe:/a:centos:centos:cyrus-sasl, p-cpe:/a:debian:debian_linux:cyrus-sasl2, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-devel, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-gs2, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-gssapi, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-ldap, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-lib, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-md5, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-ntlm, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-plain, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-scram, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl-sql, p-cpe:/a:redhat:enterprise_linux:cyrus-sasl

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: 10/7/2026

Reference Information

CVE: CVE-2026-107161

Detections

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