RARLAB WinRAR < 7.23 Heap-Based Buffer Overflow (CVE-2026-14191)

high Nessus Plugin ID 324970

Synopsis

The remote Windows host has an application installed which is affected by a heap-based buffer overflow vulnerability.

Description

The version of RARLAB WinRAR installed on the remote Windows host is prior to 7.23. It is, therefore, affected by a heap-based buffer overflow vulnerability:

- An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser. The RecItems vector is sized only when the first .rev file in a set is processed; subsequent .rev files supply an independent RecNum value that is never validated against the actual size of RecItems. A crafted set of .rev files can write an attacker-controlled value at an attacker-controlled offset past the allocation, corrupting adjacent heap objects. An attacker can leverage this vulnerability to execute code in the context of the current process. (CVE-2026-14191)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to RARLAB WinRAR version 7.23 or later.

Plugin Details

Severity: High

ID: 324970

File Name: winrar_7_23.nasl

Version: 1.2

Type: Local

Agent: windows

Family: Windows

Published: 7/3/2026

Updated: 7/6/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.04

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-14191

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/a:rarlab:winrar

Required KB Items: installed_sw/RARLAB WinRAR, SMB/Registry/Enumerated

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2026

Vulnerability Publication Date: 6/30/2026

Reference Information

CVE: CVE-2026-14191

Detections

Analytics