CVE-2026-55195

Name	CVE-2026-55195
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
py7zr (PTS)	bullseye (security), bullseye	0.11.3+dfsg-1+deb11u1	vulnerable
	bookworm	0.11.3+dfsg-5	vulnerable
	trixie	0.22.0+dfsg-1	vulnerable
	forky, sid	1.1.3+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
py7zr	source	(unstable)	1.1.3+dfsg-1

Notes

https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774
Fixed by: https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b (v1.1.3)