Linux Distros Unpatched Vulnerability : CVE-2026-18495

medium Nessus Plugin ID 345245

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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 flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption. (CVE-2026-18495)

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: Medium

ID: 345245

File Name: unpatched_CVE_2026_18495.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 9/12/2026

Updated: 10/7/2026

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: Low

Score: 3.9

Percentile: 52.43

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-2026-18495

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.6

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/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:gdal, p-cpe:/a:canonical:ubuntu_linux:neuron, p-cpe:/a:canonical:ubuntu_linux:qtwebengine-opensource-src, p-cpe:/a:canonical:ubuntu_linux:texmaker, p-cpe:/a:canonical:ubuntu_linux:tiff, p-cpe:/a:centos:centos:compat-libtiff3, p-cpe:/a:centos:centos:libtiff-devel, p-cpe:/a:centos:centos:libtiff-static, p-cpe:/a:centos:centos:libtiff-tools, p-cpe:/a:centos:centos:libtiff, p-cpe:/a:centos:centos:mingw-libtiff, p-cpe:/a:centos:centos:mingw32-libtiff-static, p-cpe:/a:centos:centos:mingw32-libtiff, p-cpe:/a:centos:centos:mingw64-libtiff-static, p-cpe:/a:centos:centos:mingw64-libtiff, p-cpe:/a:debian:debian_linux:tiff, p-cpe:/a:redhat:enterprise_linux:compat-libtiff3, p-cpe:/a:redhat:enterprise_linux:libtiff-devel, p-cpe:/a:redhat:enterprise_linux:libtiff-static, p-cpe:/a:redhat:enterprise_linux:libtiff-tools, p-cpe:/a:redhat:enterprise_linux:libtiff, p-cpe:/a:redhat:enterprise_linux:mingw-libtiff, p-cpe:/a:redhat:enterprise_linux:mingw32-libtiff-static, p-cpe:/a:redhat:enterprise_linux:mingw32-libtiff, p-cpe:/a:redhat:enterprise_linux:mingw64-libtiff-static, p-cpe:/a:redhat:enterprise_linux:mingw64-libtiff

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: 9/11/2026

Reference Information

CVE: CVE-2026-18495

Detections

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