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Microsoft Security Response CenterCVE-2026-76957

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

Mariner

Read the vendor bulletin Get alerts for azl3 expat 2.8.2-1 on Azure Linux
4.9CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 expat 2.8.2-1 on Azure Linux 3.0
  • azl3 cmake 3.30.3-15 on Azure Linux 3.0
  • azl3 python3 3.12.9-14 on Azure Linux 3.0
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 affected products: azl3 cmake 3.30.3-15 on Azure Linux 3.0, azl3 python3 3.12.9-14 on Azure Linux 3.0.
Timeline

When this advisory changed

  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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-50219View CVSS, KEV, EPSS, and threat contextCVE-2026-56131View CVSS, KEV, EPSS, and threat contextCVE-2026-56412View CVSS, KEV, EPSS, and threat contextCVE-2026-76957View CVSS, KEV, EPSS, and threat context
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