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CVE-2026-15310 zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits

🗓️ 25 Aug 2026 15:07:58Reported by PSFType 
cvelist
 cvelist
🔗 www.cve.org👁 297 Views

Python zipfile bzip2/LZMA/Zstd decompression allocates unbounded memory enabling exhaustion.

Related
Affected
Refs
[
  {
    "defaultStatus": "unaffected",
    "product": "CPython",
    "repo": "https://github.com/python/cpython",
    "vendor": "Python Software Foundation",
    "versions": [
      {
        "version": "0",
        "lessThan": "3.10.22",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.11.0",
        "lessThan": "3.11.17",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.12.0",
        "lessThan": "3.12.15",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.13.0",
        "lessThan": "3.13.16",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.14.0",
        "lessThan": "3.14.8",
        "status": "affected",
        "versionType": "python"
      },
      {
        "version": "3.15.0a1",
        "lessThan": "3.15.0rc2",
        "status": "affected",
        "versionType": "python"
      }
    ]
  }
]

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