GNU mtools up to 4.0.49 vfat vfat.c parse_vses out-of-bounds write

Summaryinfo

A vulnerability described as problematic has been identified in GNU mtools up to 4.0.49. This issue affects the function parse_vses of the file vfat.c of the component vfat. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2026-118384. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability has been found in GNU mtools up to 4.0.49 and classified as problematic. This vulnerability affects the function parse_vses of the file vfat.c of the component vfat. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

This vulnerability was named CVE-2026-118384. The exploitation appears to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/28/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• GNU

Name

• mtools

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10
• 4.0.11
• 4.0.12
• 4.0.13
• 4.0.14
• 4.0.15
• 4.0.16
• 4.0.17
• 4.0.18
• 4.0.19
• 4.0.20
• 4.0.21
• 4.0.22
• 4.0.23
• 4.0.24
• 4.0.25
• 4.0.26
• 4.0.27
• 4.0.28
• 4.0.29
• 4.0.30
• 4.0.31
• 4.0.32
• 4.0.33
• 4.0.34
• 4.0.35
• 4.0.36
• 4.0.37
• 4.0.38
• 4.0.39
• 4.0.40
• 4.0.41
• 4.0.42
• 4.0.43
• 4.0.44
• 4.0.45
• 4.0.46
• 4.0.47
• 4.0.48
• 4.0.49

License

• open-source

Website

• Vendor: https://www.gnu.org/

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Once again VulDB remains the best source for vulnerability data.

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