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CVE-2026-6100 Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure

🗓️ 13 Apr 2026 17:15:47Reported by PSFType 
cvelist
 cvelist
🔗 www.cve.org👁 16 Views

Under memory pressure, reusing decompressor objects after a MemoryError may cause a use-after-free.

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Affected
Refs
[
  {
    "defaultStatus": "unaffected",
    "product": "CPython",
    "repo": "https://github.com/python/cpython",
    "vendor": "Python Software Foundation",
    "versions": [
      {
        "version": "0",
        "lessThan": "3.13.14",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.14.0a1",
        "lessThan": "3.14.5rc1",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.15.0a1",
        "lessThan": "3.15.0b1",
        "status": "affected",
        "versionType": "python"
      }
    ]
  }
]

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