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Avro decompression codecs apply no output size limit

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
python
Domain
backend, security

Research direction

Start by reading the codec implementations under pyiceberg/avro/codecs/, beginning with bzip2.py and then the deflate and zstd paths, to trace their decompression entry points. Define and apply a consistent output-size or expansion limit, then add coverage showing oversized decompressed output is rejected across the affected codecs.

Written by the indexing model from the issue text.

Description

bug

The codecs in pyiceberg/avro/codecs/ decompress without bounding the output — e.g. bz2.decompress(data) in bzip2.py, and the same shape in the deflate and zstd paths.

The compressed input determines the decompressed size, and no cap or expansion-ratio check is applied.

Issue investigation generated via claude, reviewed by Sung, Kevin, Fokko.

Dominant language
Python
Stars
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Forks
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Avg merge
2d 2h
Merged PRs (30d)
70

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