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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (13.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.002 · change: -0.002
Affected products
- Busybox — versions 1.00, 1.38.0
Weakness classification (CWE)
References
- lists.busybox.net/pipermail/busybox/2026-June/092353.html (Patch, Mailing List, Vendor Advisory)
- busybox.com (Product)
- busybox.net
- lists.busybox.net/pipermail/busybox/2026-June/092360.html
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.