Out-of-bounds Read in Busybox

CVE-2026-38754

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

Vulnerability class: Buffer Overflow

EPSS: 0.004 (33.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

  • Busybox — versions 1.00, 1.38.0
  • N/a — versions n/a

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-38754?
CVE-2026-38754 is a medium-severity vulnerability in Busybox, classified under Out-of-bounds Read. CVSS score: 5.1/10. Published 2026-07-15.
How severe is CVE-2026-38754?
Medium severity. CVSS v3 base score is 5.1 out of 10.