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Microsoft Security Response CenterCVE-2026-34743

XZ Utils: Buffer overflow in lzma_index_append()

Mariner

Read the vendor bulletin Get alerts for azl3 xz 5.4.4-2 on Azure Linux
LowCVSS not listedLow severity
Scope

What the vendor says is affected

  • azl3 xz 5.4.4-2 on Azure Linux 3.0
  • cbl2 cmake 3.21.4-23 on CBL Mariner 2.0
  • cbl2 xz 5.2.5-1 on CBL Mariner 2.0
  • azl3 rust 1.75.0-27 on Azure Linux 3.0
  • cbl2 rust 1.72.0-15 on CBL Mariner 2.0
  • azl3 rust 1.90.0-6 on Azure Linux 3.0
  • azl3 xz 5.4.4-3 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 5.4.4-3
  • 5.2.5-2
  • 1.75.0-28
  • 1.72.0-16
  • 1.90.0-7
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-34743View CVSS, KEV, EPSS, and threat context
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