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.

CVSS v3 6.2 MEDIUM

6.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/danifus/pyzipper/commit/93ce88e7dfd1635443197dab3fb8d477cff579ae
https://github.com/danifus/pyzipper/releases/tag/v0.4.0
https://github.com/danifus/pyzipper/security/advisories/GHSA-crqm-m339-7m2p

Configurations

No configuration.

History

24 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) pyzipper es un reemplazo para el módulo zipfile de Python que puede leer y escribir archivos zip cifrados con AES. Antes de la versión 0.4.0, un error de precedencia de operadores de Python en pyzipper/zipfile_aes.py hizo que el formato AE-2 nunca se seleccionara automáticamente durante el cifrado, lo que provocó que las entradas cifradas se escribieran en formato AE-1 y exponiendo la suma de verificación CRC32 en texto plano en la cabecera ZIP y, para archivos zip no buscables, en la sección del descriptor de datos, permitiendo a un atacante que posee el archivo forzar por fuerza bruta posibles textos planos para archivos pequeños o de baja entropía comparando los valores CRC32. Este problema está corregido en la versión 0.4.0.

Information

Published : 2026-07-17 17:17

Updated : 2026-10-24 20:10

NVD link : CVE-2026-44722

Mitre link : CVE-2026-44722

CVE.ORG link : CVE-2026-44722

JSON object : View

Products Affected

No product.

CWE

CWE-480

Use of Incorrect Operator

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