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Microsoft Security Response CenterCVE-2025-13836

Excessive read buffering DoS in http.client

Medium 1 CVE Published Dec 5, 2025 at 1:03 AM UTC

Summary

Mariner

Products covered

  • cbl2 python3 3.9.19-16 on CBL Mariner 2.0

  • cbl2 python3 3.9.19-17 on CBL Mariner 2.0

  • azl3 python3 3.12.9-6 on Azure Linux 3.0

  • azl3 python3 3.12.9-7 on Azure Linux 3.0

  • azl3 python3 3.12.9-5 on Azure Linux 3.0

  • azl3 python-py 1.11.0-1 on Azure Linux 3.0

Remediation

CBL-Mariner Releases Release Notes

Vendor-listed fixes

  • 3.12.9-7

CVEs in this advisory 1

Updates

  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.