CVE-2026-44722
Description
pyzipper is a replacement for Python's zipfile that can read and write AES encrypted zip files. Prior to 0.4.0, a Python operator precedence bug in pyzipper/zipfile_aes.py caused the AE-2 format to never be automatically selected during encryption, causing encrypted entries to be written in AE-1 format and exposing the plaintext CRC32 checksum in the ZIP header and, for unseekable zip archives, in the datadescripter section, allowing an attacker who possesses the archive to brute-force candidate plaintexts for small or low-entropy files by comparing CRC32 values. This issue is fixed in version 0.4.0.
How to fix
- pyzipper0.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyzipperPyPI | v < 0.4.0 | 0.4.0 |
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Attack Surface Management
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