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PYSEC-2026-4014
virtualenvBatchActivator.quote() returned its input unchanged, the only activator with
no escaping at all. --prompt, the VIRTUALENV_PROMPT environment variable,
and the config file all set the prompt, and activate.bat writes it straight
into @set "VAR=value". A prompt containing a double quote closes that string
early, and whatever follows runs as live cmd.exe syntax. For example, a venv
created with --prompt 'x" & calc & "' runs calc the moment someone runs
activate.bat.
Anyone who templates a prompt from untrusted input (a CI job using a branch name, a wrapper script deriving an environment name from user input) hands an attacker code execution in the shell of anyone who activates the resulting venv on Windows.
Fixed in 21.7.12 by escaping the characters cmd.exe treats as live syntax inside this construct.
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Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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