CVE-2026-55195: Miurahr PY7ZR

High severity, CVSS 8.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Miurahr PY7ZR: before 1.1.3 (fixed in 1.1.3)

Published 2026-07-08. Last modified 2026-07-10.