What is CVE-2026-118384?

CVE-2026-118384 is a medium-severity vulnerability in GNU Mtools, classified under CWE-839. CVSS score: 6.1/10. Published 2026-10-28.

How severe is CVE-2026-118384?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in GNU Mtools

CVE-2026-118384

GNU mtools through 4.0.49 has an out-of-bounds write in parse_vses in vfat.c.

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (24.9th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

GNU Mtools

Weakness classification (CWE)

CWE-839

References

ftp.gnu.org/gnu/mtools/mtools-4.0.49.tar.gz (product)
lists.gnu.org/archive/html/info-gnu/2025-06/msg00004.html (product)
github.com/deepin-community/mtools/blob/16d295331a1cfbcf02ad0b2f03c9b906197cf3e… (product)
github.com/deepin-community/mtools/blob/16d295331a1cfbcf02ad0b2f03c9b906197cf3e… (product)

Frequently asked questions

What is CVE-2026-118384?: CVE-2026-118384 is a medium-severity vulnerability in GNU Mtools, classified under CWE-839. CVSS score: 6.1/10. Published 2026-10-28.
How severe is CVE-2026-118384?: Medium severity. CVSS v3 base score is 6.1 out of 10.