CVE-2023-45853CriticalCVSS 9.8

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
May 31, 2026
Last Modified
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🔗 CVE IDs covered (1)

CVE-2023-45853 →

📋 Description

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.

🎯 Affected products22

  • azl3 blosc 1.21.6-1 on Azure Linux 3.0
  • azl3 cloud-hypervisor 32.0-2 on Azure Linux 3.0
  • azl3 cloud-hypervisor-cvm 38.0.72-2 on Azure Linux 3.0
  • azl3 cloud-hypervisor-cvm 38.0.72.2-1 on Azure Linux 3.0
  • azl3 keras 2.11.0-3 on Azure Linux 3.0
  • azl3 keras 3.1.1-1 on Azure Linux 3.0
  • azl3 rubygem-mini_portile2 2.8.0-1 on Azure Linux 3.0
  • azl3 rust 1.75.0-1 on Azure Linux 3.0
  • azl3 rust 1.75.0-14 on Azure Linux 3.0
  • azl3 rust 1.85.0-1 on Azure Linux 3.0
  • azl3 rust 1.86.0-1 on Azure Linux 3.0
  • azl3 tcl 8.6.13-3 on Azure Linux 3.0
  • azl3 zlib 1.3-1 on Azure Linux 3.0
  • azl3 zlib 1.3.1-1 on Azure Linux 3.0
  • cbl2 boost 1.76.0-4 on CBL Mariner 2.0
  • cbl2 cloud-hypervisor 32.0-2 on CBL Mariner 2.0
  • cbl2 cloud-hypervisor-cvm 38.0.72-1 on CBL Mariner 2.0
  • cbl2 cloud-hypervisor-cvm 38.0.72.2-1 on CBL Mariner 2.0
  • cbl2 rubygem-mini_portile2 2.8.0-1 on CBL Mariner 2.0
  • cbl2 rust 1.72.0-5 on CBL Mariner 2.0
  • cbl2 tcl 8.6.13-3 on CBL Mariner 2.0
  • cbl2 zlib 1.2.13-2 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.3.1-1 KBCBL-Mariner Releases (Security Update) — fixed build 3.1.1-1 KBCBL-Mariner Releases (Security Update) — fixed build - KBCBL-Mariner Releases (Security Update) — fixed build 2.8.0-1 KBCBL-Mariner Releases (Security Update) — fixed build 1.2.13-2 KBCBL-Mariner Releases (Security Update) — fixed build 8.6.13-3 KBCBL-Mariner Releases (Security Update) — fixed build 1.72.0-5 KBCBL-Mariner Releases (Security Update) — fixed build 32.0-2 KBCBL-Mariner Releases (Security Update) — fixed build 1.76.0-4 KBCBL-Mariner Releases (Security Update) — fixed build 1.85.0-1 KBCBL-Mariner Releases (Security Update) — fixed build 1.21.6-1 KBCBL-Mariner Releases (Security Update) — fixed build 1.75.0-1 KBCBL-Mariner Releases (Security Update) — fixed build 38.0.72.2-1 KBCBL-Mariner Releases (Security Update)

🔗 References (2)