Back to vendor advisories
Microsoft Security Response CenterCVE-2026-85091

zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate

HighVendor CVSS 7.4 / 10 1 CVE Published Sep 5, 2026 at 1:25 AM UTC

Summary

Mariner

Products covered

  • azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0

  • azl3 zlib 1.3.2-1 on Azure Linux 3.0

  • azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0

  • azl3 kata-containers 3.32.0.kata0-2 on Azure Linux 3.0

  • azl3 kata-containers 3.32.0.kata0-5 on Azure Linux 3.0

Remediation

Release Notes

Vendor-listed fixes

  • 1.3.2-2

CVEs in this advisory 1

Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Added fixed versions: 1.3.2-2.
    • Added affected products: azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0.
    • The vendor changed its remediation guidance.
    • Added affected products: azl3 kata-containers 3.32.0.kata0-5 on Azure Linux 3.0.
    • Removed affected products: azl3 mariadb 10.11.18-1 on Azure Linux 3.0, azl3 mysql 8.0.46-1 on Azure Linux 3.0, azl3 nodejs 24.20.0-1 on Azure Linux 3.0.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.