FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling. With LFN enabled, fno.fname can be up to 255 characters; many callers copy it into short fixed buffers without bounds checks, causing overflow. This maps to CWE-120 (Buffer Copy without Checking Size of Input). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
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References
History
Wed, 01 Jul 2026 15:30:00 +0000
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Wed, 01 Jul 2026 14:30:00 +0000
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| Description | FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling. With LFN enabled, fno.fname can be up to 255 characters; many callers copy it into short fixed buffers without bounds checks, causing overflow. This maps to CWE-120 (Buffer Copy without Checking Size of Input). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total. | |
| Title | FatFs Buffer Overflow via Unbounded LFN Filename Copy | |
| Weaknesses | CWE-120 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: runZero
Published:
Updated: 2026-07-01T15:06:59.026Z
Reserved: 2026-04-20T15:06:24.308Z
Link: CVE-2026-6688
Updated: 2026-07-01T15:06:47.991Z
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Weaknesses