CVE-2026-113732
High
Description
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.2, FishActivator inherits ViaTemplateActivator.quote(), which uses POSIX shlex.quote() even though fish interprets backslashes and single quotes differently. An attacker-influenced environment path, --prompt, or VIRTUALENV_PROMPT value containing a backslash before a quote can therefore terminate the generated fish literal and execute command substitution when the user sources activate.fish. This issue is fixed in version 21.14.2.
SeverityHigh
CVSS7.8
Exploit probability—
ProductVirtualenv
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-78OS command injectionCWE-116CWE-116
How to fix
Update
- virtualenv21.14.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| virtualenvPyPI | v < 21.14.2 | 21.14.2 |
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