Code Injection in py3-virtualenv - CVE-2026-113718
Published: November 9, 2026
Vulnerability identifier: #VU163143
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-2026-113718
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker who controls virtualenv argument data to execute commands with the activating user's privileges.
The vulnerability exists due to encoding-dependent quoting in virtualenv's POSIX xonsh activation script when UTF-8 output is decoded using a legacy multibyte encoding such as GBK. An attacker who controls virtualenv argument data can supply a malicious prompt or destination value that escapes its string literal when a user subsequently sources activate.xsh.
Affected software
py3-virtualenv
How to mitigate CVE-2026-113718
Install security update from vendor's website.
py3-virtualenv - update to 21.14.9