python-apt only checks the MD5 sums of downloaded files in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py in version 1.9.0ubuntu1 and earlier. This allows a man-in-the-middle attack which could potentially be used to install altered packages and has been fixed in versions 1.9.0ubuntu1.2, 1.6.5ubuntu0.1, 1.1.0~beta1ubuntu0.16.04.7, 0.9.3.5ubuntu3+esm2, and 0.8.3ubuntu7.5.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| python-apt(PyPI) | 0 | 0.8.3ubuntu7.5 | N/A |
| python-apt(PyPI) | 0.9.0 | 0.9.3.5ubuntu3 | N/A |
| python-apt(PyPI) | 1.0.0 | 1.1.0 | N/A |
| python-apt(PyPI) | 1.2.0 | 1.6.5ubuntu0.1 | N/A |
| python-apt(PyPI) | 1.7.0 | 1.9.0ubuntu1.2 | N/A |
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