CVE-2026-55195
py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size
CVSS Score
0.0
EPSS Score
0.3%
EPSS Percentile
24th
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.
| CWE | CWE-409 |
| Vendor | miurahr |
| Product | py7zr |
| Published | Jul 8, 2026 |
| Last Updated | Jul 9, 2026 |
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Affected Versions
miurahr / py7zr
< 1.1.3