OS Command Injection in py3-virtualenv - CVE-2026-113776
Published: November 9, 2026
Vulnerability identifier: #VU163139
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113776
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unprivileged local attacker to execute arbitrary code with the privileges of a user activating a virtual environment.
The vulnerability exists due to sequential placeholder substitution in virtualenv activation templates rewriting previously quoted values when an environment path or prompt contains a placeholder name. An unprivileged local attacker can influence that path or prompt to inject code that runs when the victim activates the environment.
Affected software
py3-virtualenv
How to mitigate CVE-2026-113776
Install security update from vendor's website.
py3-virtualenv - update to 21.14.2