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Microsoft Security Response CenterCVE-2026-72522

libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated the same as high surrogates during Unicode processing in the *_toUtf16 functions.

Mariner

Read the vendor bulletin Get alerts for azl3 expat 2.8.2-1 on Azure Linux
6.2CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 expat 2.8.2-1 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 2.8.3-1
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
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.

    • Removed affected products: azl3 cmake 3.30.3-15 on Azure Linux 3.0, azl3 python3 3.12.9-14 on Azure Linux 3.0.
    • Added fixed versions: 2.8.3-1.
    • The vendor changed its remediation guidance.
    • 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-2026-72522View CVSS, KEV, EPSS, and threat context
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