Algorithmic Complexity Affecting py7zr package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-PY7ZR-17937566
- published10 Jul 2026
- disclosed8 Jul 2026
Introduced: 8 Jul 2026
CVE-2026-55206 (opens in a new tab)How to fix?
There is no fixed version for Debian:12 py7zr.
NVD Description
Note: Versions mentioned in the description apply only to the upstream py7zr package and not the py7zr package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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.