SB2026081944 - Multiple vulnerabilities in pyinstaller

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026081944

SB2026081944 - Multiple vulnerabilities in pyinstaller

Published: August 19, 2026

Security Bulletin ID SB2026081944
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Reliance on Untrusted Inputs in a Security Decision (CVE-ID: N/A)

CWE-ID: CWE-807 - Reliance on Untrusted Inputs in a Security Decision

CVSSv4: 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]


The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to reliance on untrusted inputs in a security decision in the PyInstaller bootloader when inheriting spoofed environment variables in privileged executables. A local user can manipulate environment variables to execute arbitrary code.

Exploitation requires the ability to execute a privileged PyInstaller-built executable, such as a setuid-root executable on POSIX systems or a UAC-enabled executable on Windows.


2) Reliance on Untrusted Inputs in a Security Decision (CVE-ID: N/A)

CWE-ID: CWE-807 - Reliance on Untrusted Inputs in a Security Decision

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References