{"id":"CVE-2023-45853","aliases":["GHSA-mq29-j5xf-cjwr","PYSEC-2026-501"],"url":"https://o3.security/vulnerability/CVE-2023-45853","summary":"pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency","details":"MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. NOTE: MiniZip is not a supported part of the zlib product. NOTE: pyminizip through 0.2.6 is also vulnerable because it bundles an affected zlib version, and exposes the applicable MiniZip code through its compress API.","published":"2023-10-14T00:00:00Z","modified":"2026-08-12T14:51:16.762049Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.03179,"percentile":0.8736,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pyminizip","fixedVersion":null}],"fix":{"url":"https://github.com/madler/zlib/pull/843","label":"madler/zlib#843"},"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-470355.html"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-769027.html"},{"type":"WEB","url":"https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356"},{"type":"WEB","url":"https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61"},{"type":"WEB","url":"https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4"},{"type":"WEB","url":"https://www.winimage.com/zLibDll/minizip.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45853.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-45853"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202401-18"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20231130-0009/"},{"type":"FIX","url":"https://github.com/madler/zlib/pull/843"},{"type":"PACKAGE","url":"https://pypi.org/project/pyminizip/#history"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2023/10/20/9"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2024/01/24/10"},{"type":"ARTICLE","url":"https://lists.debian.org/debian-lts-announce/2023/11/msg00026.html"},{"type":"WEB","url":"https://github.com/madler/zlib/commit/73331a6a0481067628f065ffe87bb1d8f787d10c"},{"type":"PACKAGE","url":"https://github.com/smihica/pyminizip"},{"type":"WEB","url":"https://github.com/smihica/pyminizip/blob/master/zlib-1.2.11/contrib/minizip/zip.c"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20231130-0009"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T14:51:16.762049Z"}}