CVE-2026-55206
NoneCVSS
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EPSS
0.3%
Published
Jul 8, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | python-py7zr | 0 | 1.0.0-bp160.2.1 |
| openSUSE:Tumbleweed | python-py7zr | 0 | 1.1.3-1.1 |
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