Reliance on Untrusted Inputs in a Security Decision in pyinstaller - #VU144255
Published: August 19, 2026
Vulnerability identifier: #VU144255
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-807
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to remove protected resources.
The vulnerability exists due to reliance on untrusted inputs in a security decision in the PyInstaller onefile bootloader on POSIX systems when inheriting spoofed _PYI_ environment variables. A local user can manipulate environment variables to remove protected resources.
This issue affects onefile executables on POSIX systems and requires the ability to execute a privileged PyInstaller-built executable.
Affected software
pyinstaller
Remediation
Install security update from vendor's website.
pyinstaller - update to 6.22.1