Description 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.
CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Exploitability: 3.9 | Impact: 5.9 Attack Vector: Network
Complexity: Low
Privileges: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High
Affected Packages30 packages Show 25 more packages
🔴 Vulnerability Details5 GHSA Fiona affected by CVE-2023-45853 related to MiniZip madler-zlib ↗ 2024-07-16 ▶ OSV Fiona affected by CVE-2023-45853 related to MiniZip madler-zlib ↗ 2024-07-16 ▶ OSV CVE-2023-45853: MiniZip in zlib through 1 ↗ 2023-10-14 ▶ GHSA pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency ↗ 2023-10-14 ▶ OSV pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency ↗ 2023-10-14 ▶
📋 Vendor Advisories8 Oracle Oracle Oracle Fusion Middleware Risk Matrix: Outside In Search Export SDK (zlib) — CVE-2023-45853 ↗ 2025-10-15 ▶ CISA ICS Siemens SCALANCE W700 ↗ 2025-02-13 ▶ Ubuntu zlib vulnerability ↗ 2024-11-13 ▶ Oracle Oracle Oracle Fusion Middleware Risk Matrix: SSL Module (zlib) — CVE-2023-45853 ↗ 2024-07-15 ▶ CISA ICS Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1 ↗ 2023-12-14 ▶ Show 3 more
🕵️ Threat Intelligence4 Qualys Oracle Critical Patch Update, October 2025 Security Update Review ↗ 2025-10-23 ▶ Qualys Oracle Critical Patch Update, October 2025 Security Update Review | Qualys ↗ 2025-10-23 ▶ Qualys Oracle Critical Patch Update, July 2024 Security Update Review ↗ 2024-07-17 ▶ Qualys Oracle Critical Patch Security Update: July 2024 Review | Qualys ↗ 2024-07-17 ▶