CVE-2026-38754 Busybox CVE debrief

Who should care

Users and administrators of Busybox v1.38.0 should be aware of this vulnerability and take necessary precautions to prevent exploitation. This includes reviewing system deployments for affected versions and planning for vendor-supported updates or mitigations.

Technical summary

A heap overflow vulnerability exists in the ifsbreakup() function (shell/ash.c) of Busybox v1.38.0. This vulnerability allows attackers to cause a Denial of Service (DoS) via supplying a crafted input. The vulnerability has a CVSS score of 7.5 and a severity of HIGH. Affected systems should be reviewed for Busybox v1.38.0 usage. Users and administrators should verify Busybox v1.38.0 installations, review vendor advisories for patching guidance, and implement compensating controls to detect and prevent potential attacks.

Defensive priority

High priority should be given to patching or mitigating this vulnerability to prevent potential Denial of Service (DoS) attacks.

Recommended defensive actions

• Inventory and verify Busybox v1.38.0 installations
• Apply patches or updates provided by the vendor
• Implement compensating controls to detect and prevent potential attacks
• Monitor for suspicious activity and exception tracking
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-15T22:16:47.233Z and was last modified on 2026-07-16T19:57:49.763Z. The NVD entry is currently Analyzed. Evidence and details are limited to CVE and NVD information. Defenders should verify Busybox v1.38.0 usage and review vendor advisories for patching guidance.

Official resources