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  <updated>2026-10-15T09:45:51.811005+00:00</updated>
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    <id>https://db.gcve.eu/vuln/ghsa-q5fm-55c2-v6j9</id>
    <title>GHSA-q5fm-55c2-v6j9 — Fiona affected by CVE-2023-45853 related to MiniZip madler-zlib</title>
    <updated>2026-10-15T09:45:51.811813+00:00</updated>
    <content type="xhtml">
      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> PyPI: fiona</p>
<p>### Summary
Vulnerability scan of fiona shows [CVE-2023-45853](https://nvd.nist.gov/vuln/detail/CVE-2023-45853). The vulnerability is in GDAL, a dependency of fiona.</p>
<p>### Details
Fiona depends on GDAL and GDAL has a port of minizip. MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. The GDAL project has addressed the CVE in version 3.8.0. See https://lists.osgeo.org/pipermail/gdal-dev/2023-November/057881.html.</p>
<p>The Fiona version 1.9.6 wheels on PyPI include GDAL version 3.6.4 and thus could be vulnerable. All of the Fiona 1.10 pre-release wheels in PyPI include GDAL version 3.8.4 and are not vulnerable.</p>
<p>### Impact
Systems which use GDAL versions prior to 3.8.0 to open unchecked zip files, whether in combination with fiona or not, could be susceptible to buffer overflows.</p></div>
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