What is CVE-2026-38755?

CVE-2026-38755 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.

Which CVE IDs does CVE-2026-38755 cover?

CVE-2026-38755 covers the following CVE IDs: CVE-2026-38755. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-38755?

CVE-2026-38755 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-38755?

CVE-2026-38755 affects 1 product, including: azl3 busybox 1.36.1-24 on Azure Linux 3.0.

CVE-2026-38755HighCVSS 7.5

A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.

Vendor

Microsoft Security Response Center (MSRC)

Published

July 23, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-38755 →

🎯 Affected products1

azl3 busybox 1.36.1-24 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.36.1-25

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-38755
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade