Improper Handling of Highly Compressed Data (Data Amplification)
CVE-2026-55195
Summary
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.
- LOW
- NETWORK
- NONE
- NONE
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
The software does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.
References
Advisory Timeline
- Published
