CVE-2026-55195 | THREATINT

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.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-08 | Updated 2026-07-08 | Assigner GitHub_M

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)

Product status

< 1.1.3

affected

References

github.com/.../py7zr/security/advisories/GHSA-gjrg-mpp7-g774

github.com/...ommit/28faf107b64374fa5a02bfb93aa2024e281ca97b

github.com/miurahr/py7zr/releases/tag/v1.1.3

cve.org (CVE-2026-55195)

nvd.nist.gov (CVE-2026-55195)

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