CVE-2026-55195
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductPy7zr
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-409CWE-409
How to fix
Update
- py7zr1.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| py7zrPyPI | v < 1.1.3 | 1.1.3 |
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