Vulnerability in Danifus Pyzipper
CVE-2026-44722
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.
EPSS: 0.001 (1.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Danifus Pyzipper — versions < 0.4.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-44722?
- CVE-2026-44722 is a medium-severity vulnerability in Danifus Pyzipper, classified under CWE-480. CVSS score: 6.2/10. Published 2026-07-17.
- How severe is CVE-2026-44722?
- Medium severity. CVSS v3 base score is 6.2 out of 10.