{"id":"UBUNTU-CVE-2026-44722","details":"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.","modified":"2026-07-29T10:18:12.094317448Z","published":"2026-07-17T17:17:00Z","upstream":["CVE-2026-44722"],"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"}],"affected":[{"package":{"name":"python-pyzipper","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-pyzipper?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.3.6-5"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-pyzipper","binary_version":"0.3.6-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44722.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}