Incomplete dangerous-extension list in PeaZip object open allows execution of a program or command from a crafted archive entry without confirmation
Summary
| CVE | CVE-2026-104024 |
|---|---|
| State | PUBLISHED |
| Assigner | Secur0 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-15 14:17:13 UTC |
| Updated | 2026-10-16 19:56:15 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 4.6 MEDIUM from 4daa8cea-433a-44bd-9456-53b127fc289a
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.001280000 probability, percentile 0.021960000 (date 2026-10-16)
Problem Types: CWE-184 | CWE-693 | CWE-184 CWE-184 Incomplete List of Disallowed Inputs | CWE-693 CWE-693 Protection Mechanism Failure
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 4daa8cea-433a-44bd-9456-53b127fc289a | Secondary | 4.6 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 4.6 | MEDIUM | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
CVSS v4.0 Breakdown
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| secur0.com/en/cna/cve-list/cve-2026-104024-incomplete-extension-list-in-... | 4daa8cea-433a-44bd-9456-53b127fc289a | secur0.com | |
| github.com/peazip/PeaZip/commit/90ddbaee0945a4d8ffa4d972d43711bbfb9576ba | 4daa8cea-433a-44bd-9456-53b127fc289a | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: cgomezpob (en)
CNA: Dario Rivas Quero (en)
CNA: Secur0 CNA (en)
Additional Advisory Data
Solutions
CNA: Upgrade to PeaZip 11.3.0 or higher. The fix extends the dangerous-extension list to cover shell-executable and scripting-host types (among them .url and .lnk) so the confirmation prompt is raised for them as well, and applies the check to the open/preview-with-associated-application route in addition to the double-click handler. Fix commit 90ddbae (2026-08-27).