{"id":"CVE-2026-44722","summary":"pyzipper: Encryption bypass for small files encrypted with pyzipper","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.","aliases":["GHSA-crqm-m339-7m2p","PYSEC-2026-3044"],"modified":"2026-07-19T03:46:53.318229978Z","published":"2026-07-17T16:42:01.472Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-480"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44722.json"},"references":[{"type":"WEB","url":"https://github.com/danifus/pyzipper/releases/tag/v0.4.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44722.json"},{"type":"ADVISORY","url":"https://github.com/danifus/pyzipper/security/advisories/GHSA-crqm-m339-7m2p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44722"},{"type":"FIX","url":"https://github.com/danifus/pyzipper/commit/93ce88e7dfd1635443197dab3fb8d477cff579ae"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/danifus/pyzipper","events":[{"introduced":"0"},{"fixed":"93ce88e7dfd1635443197dab3fb8d477cff579ae"},{"fixed":"a814388f5a8a7b172ee2e2ca668fc33c7516e6bc"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.4.0"}]}}],"versions":["v0.3.6","v0.3.5","v0.3.4","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}