[3.14] gh-119342: Fix a potential denial of service in plistlib (GH-119343)#142143
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…nGH-119343) Reading a specially prepared small Plist file could cause OOM because file's read(n) preallocates a bytes object for reading the specified amount of data. Now plistlib reads large data by chunks, therefore the upper limit of consumed memory is proportional to the size of the input file. (cherry picked from commit 694922c) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This was referenced Dec 1, 2025
serhiy-storchaka merged commit b64441e into python:3.14 51 checks passed
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Reading a specially prepared small Plist file could cause OOM because file's
read(n) preallocates a bytes object for reading the specified amount of
data. Now plistlib reads large data by chunks, therefore the upper limit of
consumed memory is proportional to the size of the input file.
(cherry picked from commit 694922c)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com