If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "3.9.0"
},
{
"introduced": "3.13.1"
},
{
"fixed": "3.13.11"
},
{
"introduced": "3.14.0"
},
{
"fixed": "3.14.1"
}
]
}