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Microsoft Security Response CenterCVE-2026-56853

Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http

MediumVendor CVSS 7.5 / 10 1 CVE Published Aug 20, 2026 at 10:02 PM UTC

Summary

Mariner

Products covered

  • azl3 golang 1.25.12-1 on Azure Linux 3.0

  • azl3 golang 1.26.5-2 on Azure Linux 3.0

  • azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0

  • azl3 tensorflow 2.16.1-11 on Azure Linux 3.0

  • azl3 golang 1.27.0-1 on Azure Linux 3.0

  • azl3 golang 1.26.7-1 on Azure Linux 3.0

Remediation

See the Microsoft Security Update Guide for the update that applies to your product.

CVEs in this advisory 1

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.

    • Severity changed from High to Medium.
    • Added affected products: azl3 golang 1.26.7-1 on Azure Linux 3.0, azl3 golang 1.27.0-1 on Azure Linux 3.0.
    • The vendor changed its remediation guidance.
    • The vendor changed the advisory's last-updated date.

Updates

  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.