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Fencer Vulns
medium 6.1

CVE-2026-118384 json

GNU mtools before 4.0.50 has an out-of-bounds write in parse_vses in vfat.c.

published 2026-10-28 12 d ago modified 2026-11-02 7 d ago also EUVD-2026-111572

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

GNU mtools before 4.0.50 has an out-of-bounds write in parse_vses in vfat.c.

Patch / fix

  • GNU mtools 4.0.50

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-118384 updated cvss 6.1

mtools: mtools: Denial of Service via out-of-bounds write in VFAT parsing

  • Red Hat Enterprise Linux 6 mtools 4.0.43-7.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 mtools 4.0.43-7.el10 Red Hat Enterprise Linux 8 mtools 4.0.43-7.el10 Red Hat Enterprise Linux 9 mtools 4.0.43-7.el10 Red Hat Enterprise Linux 10 mtools 4.0.43-7.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 d ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Affected products

  • GNU mtools

Classification

Weakness
  • CWE-839 Numeric Range Comparison Without Minimum Check

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.