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PatchSiren cyber security CVE debrief

CVE-2026-38754 Busybox CVE debrief

CVE-2026-38754 is a heap overflow vulnerability in the ifsbreakup() function 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. Users and administrators should be aware of this vulnerability and take necessary precautions to prevent exploitation.

Vendor
Busybox
Product
Busybox
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-15
Original CVE updated
2026-07-22
Advisory published
2026-07-15
Advisory updated
2026-07-22

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-38754 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-38754

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-38754 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-38754

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.