Is CVE-2026-118384 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-118384 being exploited in the wild.

How severe is CVE-2026-118384?

Medium severity, with a CVSS score of 6.1, published 28 October 2026.

Is there a fix for CVE-2026-118384?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-118384 attacked?

It is attacked with local access.

Am I affected by CVE-2026-118384?

Check whether you run Gnu Mtools at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-118384: GNU mtools out-of-bounds write in vfat parsing

CVE-2026-118384 · Severity: medium · CVSS 6.1 · Published 2026-10-28

GNU mtools is a utility suite for manipulating MS-DOS file systems. A vulnerability in its FAT volume parsing code allows an attacker who controls a crafted disk image to write beyond allocated memory boundaries, potentially causing a crash or code execution when the tool processes the malicious file.

Vendors: Gnu.

Quick answers

Is CVE-2026-118384 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-118384 being exploited in the wild.
How severe is CVE-2026-118384?: Medium severity, with a CVSS score of 6.1, published 28 October 2026.
Which products and versions are affected?: Gnu Mtools through 4.0.49.
Is there a fix for CVE-2026-118384?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-118384 attacked?: It is attacked with local access.
Am I affected by CVE-2026-118384?: Check whether you run Gnu Mtools at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds write exists in the parse_vses function in vfat.c when processing FAT volume structures. This vulnerability may be triggered by supplying a specially crafted disk image. Successful exploitation could result in memory corruption leading to denial of service or arbitrary code execution.

Affected products

GNU mtools through 4.0.49

Timeline

2026-10-28: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.