CVE-2026-44722
MediumCVSS 6.2Exploitation Probability (EPSS)
Low risk0th percentile - higher than 0% of all known CVEs
Summary
In pyzipper prior to version 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, forcing the use of AE-1 format. This exposed the plaintext CRC32 checksum in the ZIP header and, for unseekable archives, in the datadescripter section, allowing an attacker with access to the archive to brute-force candidate plaintexts for small or low-entropy files by comparing CRC32 values.
Risk Assessment
An attacker with access to the ZIP archive can perform a brute-force attack on small, low-entropy files, recovering their original content without knowing the password. This compromises the confidentiality of data intended to be protected by AES encryption.
Recommendation
Immediately upgrade pyzipper to version 0.4.0 or later. If upgrading is not possible, avoid encrypting small, low-entropy files with pyzipper.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS