Security Advisory

CVE-2026-55206

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 20:32:09

Last updated 2026-07-09 14:26:55

Assigner GitHub_M

CVSS score 8.7

State PUBLISHED

Description

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3.

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