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Microsoft Security Response CenterCVE-2025-66382

In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.

Mariner

Read the vendor bulletin Get alerts for azl3 expat 2.6.4-2 on Azure Linux
2.9CVSS out of 10Low severity
Scope

What the vendor says is affected

  • azl3 expat 2.6.4-2 on Azure Linux 3.0
  • cbl2 expat 2.6.4-3 on CBL Mariner 2.0
  • cbl2 expat 2.6.4-4 on CBL Mariner 2.0
  • cbl2 expat 2.6.4-2 on CBL Mariner 2.0
  • azl3 expat 2.6.4-4 on Azure Linux 3.0
  • azl3 expat 2.6.4-5 on Azure Linux 3.0
  • azl3 expat 2.6.4-6 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 2.8.2-1
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.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2025-66382View CVSS, KEV, EPSS, and threat context
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