UBUNTU-CVE-2026-44722 (CVE-2026-44722)
Vulnerability from osv_ubuntu – Published: 2026-07-17 17:17 – Updated: 2026-07-29 07:57 – Source websitepyzipper 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": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pyzipper",
"binary_version": "0.3.6-5"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-pyzipper",
"purl": "pkg:deb/ubuntu/python-pyzipper@0.3.6-5?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.3.6-5"
]
}
],
"aliases": [],
"details": "pyzipper is a replacement for Python\u0027s 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.",
"id": "UBUNTU-CVE-2026-44722",
"modified": "2026-07-29T07:57:02Z",
"published": "2026-07-17T17:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-44722"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-44722"
},
{
"type": "REPORT",
"url": "https://github.com/danifus/pyzipper/security/advisories/GHSA-crqm-m339-7m2p"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-44722"
]
}
Sightings
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