PT-2026-54930 · Chan · Fatfs

Hd Moore + 1 · Publicado 2026-07-01 · Atualizado 2026-07-01 · CVE-2026-6688

Mitre

CVSS v3.1

7.6

Alta

Vetor base

AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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.

Exploit

Correção

Buffer Overflow

Enumeração de Fraquezas

CWE-120

Identificadores relacionados

CVE-2026-6688

Produtos afetados

Fatfs

Referências · 5

• 🔥 https://github.com/runZeroInc/vulns-2026-fatfs-chance · Exploit
• https://elm-chan.org/fsw/ff · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-6688 · Nota de Segurança
• https://runzero.com/blog/fatfs-bugs · Nota
• https://runzero.com/advisories/fatfs-long-fn-of-downstream-cve-2026-6688 · Nota