This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-55206 →
DEBIAN-CVE-2026-55206
py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._r...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
py7zr
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
py7zr
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14
py7zr
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.3+dfsg-1"}]}]
References
- advisory security-tracker.debian.org