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Fix path traversal when downloading documents

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Closes #4713.
This commit is contained in:
Lonami Exo 2025-10-19 19:24:03 +02:00
parent baf35e9e7e
commit 369bfe1a2a
1 changed files with 4 additions and 1 deletions
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5
telethon/client/downloads.py
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@ -1054,8 +1054,11 @@ class DownloadMethods:
if os.path.isdir(file) or not file:
try:
isreserved = getattr(os.path, 'isreserved', lambda _: False) # Python 3.13 and above
name = None if possible_names is None else next(
x for x in possible_names if x
x # basename to prevent path traversal (#4713)
for x in map(os.path.basename, possible_names)
if x and not isreserved(x)
)
except StopIteration:
name = None