# CVE-2026-44722

## Summary

- **CVE ID:** CVE-2026-44722
- **Severity:** MEDIUM
- **CVSS Score:** 6.2 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** CWE-480
- **Published:** Jul 17, 2026
- **Last Modified:** Jul 17, 2026

## 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.

## Affected Products

- danifus — pyzipper (< 0.4.0)

## References

- [CNA](https://github.com/danifus/pyzipper/security/advisories/GHSA-crqm-m339-7m2p)
- [CNA](https://github.com/danifus/pyzipper/commit/93ce88e7dfd1635443197dab3fb8d477cff579ae)
- [CNA](https://github.com/danifus/pyzipper/releases/tag/v0.4.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 1.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._