CVE-2026-115586— virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)
Quick assessment
Affected
pypa virtualenv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
virtualenv 是一个用于创建隔离的虚拟 Python 环境的工具。在 21.14.9 到 21.14.13 版本期间，其 bash 脚本 在激活过程中若同时禁用了 和 POSIX 模式，会将攻击者控制的 参数值未经转义（未对美元符号 或反引号 ` ` PS1 promptvars set -o posix PS1 VIRTUAL_ENV_PROMPT` 中的值会被展开并执行命令替换，从而以激活该环境的用户身份执行任意命令。此问题已在 21.14.13 版本中修复。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-115586
Vulnerability Information
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Vulnerability Title
virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| pypa | virtualenv | >= 21.14.9, < 21.14.13 | - |
|
II. Public POCs for CVE-2026-115586
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-115586 (1)
Vendor Pages for CVE-2026-115586 (1)
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🔗 Release 21.14.13 · pypa/virtualenv · GitHub x_refsource_MISC
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