python / python/cpython

zipfile library will raise uncaught oserror when reading length incorrect zip file

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3.10 stdlib type-bug
Dominant language
Python
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Description

BPO 46931
Files
  • damaged.zip: use notepad to open and deleted some contents of the zip file
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
    closed_at = None
    created_at = <Date 2022-03-05.17:37:33.918>
    labels = ['type-bug', 'library', '3.10']
    title = 'zipfile library will raise uncaught oserror when reading length incorrect zip file'
    updated_at = <Date 2022-03-05.17:37:33.918>
    user = 'https://bugs.python.org/ultimalium'
    

    bugs.python.org fields:

    activity = <Date 2022-03-05.17:37:33.918>
    actor = 'ultimalium'
    assignee = 'none'
    closed = False
    closed_date = None
    closer = None
    components = ['Library (Lib)']
    creation = <Date 2022-03-05.17:37:33.918>
    creator = 'ultimalium'
    dependencies = []
    files = ['50658']
    hgrepos = []
    issue_num = 46931
    keywords = []
    message_count = 1.0
    messages = ['414590']
    nosy_count = 1.0
    nosy_names = ['ultimalium']
    pr_nums = []
    priority = 'normal'
    resolution = None
    stage = None
    status = 'open'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue46931'
    versions = ['Python 3.10']
    

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    First steps

    1. Read the whole issue, then the project's contributing guide.
    2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
    3. Fork the repository and make your change on a branch.
    4. Open a pull request that references the issue number.

    Research direction

    Start by reproducing the failure with damaged.zip using Python's zipfile library and inspect where reading the malformed archive raises the uncaught OSError. Done means the damaged archive is handled without an uncaught OSError, with the expected failure behavior confirmed by a regression check.

    Written by the indexing model from the issue text.

    Assessment

    Tech stack
    python
    Domain
    backend
    Issue type
    Bug
    Difficulty
    3/5
    Estimated time
    1-2 days
    Activity status
    Quiet
    Clarity
    Needs clarification
    Newbie friendliness
    45/100

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