CVE-2026-38753

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.

CVE-2026-38753 is fixed in busybox on 1 platform, first by DEBIAN-CVE-2026-38753, released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

4.9

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0015

3rd percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
busybox · Debian 14	1:1.38.0-3	DEBIAN-CVE-2026-38753	Jul 31, 2026
busybox · opensuse-leap 16.0	1.37.0-160000.7.1	OPENSUSE-SU-2026:22040-1	Oct 6, 2026
busybox · sles 15.7	1.37.0-150700.18.21.1	SUSE-SU-2026:3933-1	Sep 3, 2026
busybox · sles 16.0	1.37.0-160000.7.1	SUSE-SU-2026:24154-1	Oct 6, 2026

Details

Published
July 15, 2026
Weakness
Use After Free
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-38753

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