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Microsoft Security Response CenterCVE-2026-38753

A use-after-free in the awk_sub() function (editors/awk.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script.

MediumVendor CVSS 4.9 / 10 1 CVE Published Jul 21, 2026 at 1:05 AM UTC

Summary

Mariner

Products covered

  • azl3 busybox 1.36.1-24 on Azure Linux 3.0

  • azl3 busybox 1.36.1-26 on Azure Linux 3.0

Remediation

CBL-Mariner Releases

Vendor-listed fixes

  • 1.36.1-25

  • 1.36.1-26

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.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.