Medium severity · published Oct 28, 2026
CVE-2026-118384
GNU mtools through 4.0.49 has an out-of-bounds write in parse_vses in vfat.c
New
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
GNU mtools through 4.0.49 has an out-of-bounds write in parse_vses in vfat.c.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MT
mtools · GNU
through 4.0.49 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118384
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118384
product
https://ftp.gnu.org/gnu/mtools/mtools-4.0.49.tar.gz
product
https://lists.gnu.org/archive/html/info-gnu/2025-06/msg00004.html
product
https://github.com/deepin-community/mtools/blob/16d295331a1cfbcf02ad0b2f03c9b906197cf3ee/vfat.c#L444-L445
product
https://github.com/deepin-community/mtools/blob/16d295331a1cfbcf02ad0b2f03c9b906197cf3ee/vfat.c#L399