PeaZip up to 11.2.x Archive Object Viewer peach.pas grid_obj_open incomplete blacklist

Summaryinfo

A vulnerability was found in PeaZip up to 11.2.x and classified as critical. This affects the function grid_obj_open of the file peach.pas of the component Archive Object Viewer. The manipulation results in incomplete blacklist. This vulnerability was named CVE-2026-104024. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in PeaZip up to 11.2.x. It has been classified as critical. Affected is the function grid_obj_open of the file peach.pas of the component Archive Object Viewer. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. CWE is classifying the issue as CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Incomplete List of Disallowed Inputs (CWE-184) in the dangerous-extension confirmation of the archive object viewer (peach.pas, grid_obj_open) in PeaZip 10.5.0 through 11.2.0 on Windows allows an attacker who convinces a victim to open an entry of a crafted archive to execute a program, or an arbitrary command, with no confirmation dialog. The prompt (Do you want to run this file?) is gated by SECEXTCONST, a hard-coded list of seven extensions (exe cmd msi bat ps1 vbs reg); the check is an exact string comparison of the entry extension against that list, so it answers only whether the extension is one of the seven and never whether the shell will execute the file. Shell-executable and scripting-host types that Windows runs through ShellExecuteW are absent from the list, among them .url and .lnk. An archived Windows Internet Shortcut (.url) whose URL line is attacker-controlled is launched with no prompt, while the byte-identical content in an entry named .bat does raise the warning in the same session. A .lnk entry raises the ceiling from launching a program to running a command line, because a Windows shortcut carries arguments: a proof-of-concept shortcut targeting cmd.exe with an attacker-chosen command line executed with no prompt. The shortcut target is not confined to the local disk; the shell also resolved an attacker-named UNC path (fetching a remote payload was only attempted, not demonstrated). No privilege escalation; everything runs as the user who opened the archive.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-104024 since 10/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1562.006.

Upgrading to version 11.3.0 eliminates this vulnerability. Applying the patch 90ddbaee0945a4d8ffa4d972d43711bbfb9576ba is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• PeaZip

Version

• 11.0
• 11.1
• 11.2

Website

• Product: https://github.com/peazip/PeaZip/

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