PT-2026-53574 · Pypi · Pyminizip

Published 2026-06-29 · Updated 2026-06-29

OSV

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

pyminizip uses version 1.2.11 of zlib's code.

Fix

Related Identifiers

PYSEC-2026-501

Affected Products

Pyminizip

References · 18

• https://osv.dev/vulnerability/PYSEC-2026-501 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-45853 · Security Note
• https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4 · Note
• https://github.com/madler/zlib/pull/843 · Note
• https://github.com/madler/zlib/commit/73331a6a0481067628f065ffe87bb1d8f787d10c · Note
• https://github.com/smihica/pyminizip · Note
• https://github.com/smihica/pyminizip/blob/master/zlib-1.2.11/contrib/minizip/zip.c · Note
• https://security.gentoo.org/glsa/202401-18 · Note
• https://pypi.org/project/pyminizip · Note
• https://winimage.com/zLibDll/minizip.html · Note
• https://pypi.org/project/pyminizip/#history · Note
• https://security.netapp.com/advisory/ntap-20231130-0009 · Note
• http://openwall.com/lists/oss-security/2023/10/20/9 · Note
• https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356 · Note
• http://openwall.com/lists/oss-security/2024/01/24/10 · Note