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CVE-2026-102925— virtualenv bash and fish activation scripts execute commands embedded in paths

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 is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh scrip

CVSS 7.8 · High
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I. Basic Information for CVE-2026-102925

Vulnerability Information

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Vulnerability Title
virtualenv bash and fish activation scripts execute commands embedded in paths
Source: CVE Program / CVE List V5
Vulnerability Description
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh script, a crafted virtual environment path reaches __VIRTUAL_ENV__ when a relocated environment's recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach __TCL_LIBRARY__ or __TK_LIBRARY__. The surplus quotes can terminate the data-only quoted run and leave shell metacharacters parsed as commands when a user sources the activation script, allowing code execution with that user's privileges. This issue is fixed in version 21.7.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 < 21.7.13 -

II. Public POCs for CVE-2026-102925

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III. Intelligence Information for CVE-2026-102925

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Other References for CVE-2026-102925 (4)

Same Patch Batch · pypa · 2026-09-29 · 4 CVEs total

CVE-2026-102930 7.7 HIGH virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use
CVE-2026-102937 7.3 HIGH virtualenv: Command injection via --prompt in activate.bat (batch activator)
CVE-2026-102938 5.8 MEDIUM virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowi

IV. Related Vulnerabilities

Same product: virtualenv
Same vendor: pypa
Same weakness: CWE-78

V. Comments for CVE-2026-102925

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