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Vulnerability record · CVE-2026-38753 · published 15 July 2026

CVE-2026-38753: Busybox use after free vulnerability

Busybox · Busybox

A use-after-free in the awk_sub() function (editors/awk.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script.

4.9 CVSS 3.1 Medium EPSS 0.25% · top 85.4% CWE-416 · Use after free
4.9CVSS 3.1 base score
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
20 Jul 2026Last modified by NVD

Description

A use-after-free in the awk_sub() function (editors/awk.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted AWK script.

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://busybox.net
https://lists.busybox.net/pipermail/busybox/2026-June/092352.html Mailing ListPatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-38753), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.