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fix(lambda): preserve Unix file permissions in zip2tar conversion #10021

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fix(lambda): preserve Unix file permissions in zip2tar conversion #10021

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fix(lambda): preserve Unix file permissions in zip2tar conversion
algojogacor May 12, 2026
f7e8b11
fix(zip2tar): ensure minimum read+execute permissions on extracted files
algojogacor May 12, 2026
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8 changes: 8 additions & 0 deletions moto/awslambda/models.py
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,14 @@ def zip2tar(zip_bytes: bytes) -> io.BytesIO:
tarinfo = tarfile.TarInfo(name=zipinfo.filename)
tarinfo.size = zipinfo.file_size
tarinfo.mtime = calendar.timegm(zipinfo.date_time) - timeshift
tarinfo.mode = zipinfo.external_attr >> 16
# Ensure minimum read bits for all users.
# Lambda extracts these files to /var/task and needs
# at least 0444 (read) for files and 0555 (read+execute) for dirs.
if zipinfo.is_dir():
tarinfo.mode |= 0o555
else:
tarinfo.mode |= 0o444
infile = zipf.open(zipinfo.filename)
tarf.addfile(tarinfo, infile)

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