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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-55195

py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size

Description

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

miurahr py7zr

  • < 1.1.3affected

References