CVE-2026-115586

High

Description

virtualenv is a tool for creating isolated virtual python environments. From 21.14.9 until 21.14.13, the bash bin/activate script can copy an attacker-controlled --prompt value into PS1 without escaping dollar signs or backticks when both promptvars and POSIX mode are disabled during activation. Re-enabling promptvars, running set -o posix, or starting an interactive child bash that inherits the exported PS1 can then expand command substitution in the stored VIRTUAL_ENV_PROMPT value and execute commands as the user who activates the environment. This issue is fixed in version 21.14.13.

SeverityHigh

CVSS7.1

Exploit probability—

ProductVirtualenv

PublishedOct 23, 2026

First seenOct 23, 2026

Weakness typeCWE-78OS command injection

How to fix

Update

virtualenv21.14.13 or later

Affected products

Product	Affected versions	Fixed in
virtualenvPyPI	21.14.9 ≤ v < 21.14.13	21.14.13

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