Incorrect permission assignment for critical resource in py3-virtualenv - CVE-2026-113720
Published: November 9, 2026
Vulnerability identifier: #VU163153
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113720
CWE-ID: CWE-732
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unprivileged local attacker to execute code as the environment owner.
The vulnerability exists due to virtualenv's app-data copy seeder preserving cached file permissions instead of applying the current umask when creating a new environment. An unprivileged local attacker can modify seeded pip files when the cache was populated under a permissive umask and destination directories are traversable, causing injected code to run when the owner invokes pip.
Affected software
py3-virtualenv
How to mitigate CVE-2026-113720
Install security update from vendor's website.
py3-virtualenv - update to 21.14.9