CVE-2026-6688

Katalog CVE

CVSS 7.6 · High EPSS 0,32%

Kerentanan Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') pada elm-chan fatfs. Skor CVSS 3.1 7.6 (High) menurut CNA.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

1 Juli 2026

Terakhir diubah

2 Juli 2026

Status NVD

Analyzed

CVSS 3.1

7.6 (High), sumber CNA
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

EPSS (30 hari)

0,32% peluang dieksploitasi; lebih tinggi dari 23,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/runZeroInc/vulns-2026-fatfs-chance advisory pihak ketiga · exploit
• https://www.runzero.com/advisories/fatfs-long-fn-of-downstream-cve-2026-6688/ advisory pihak ketiga
• https://www.runzero.com/blog/fatfs-bugs/ advisory pihak ketiga · exploit
• https://elm-chan.org/fsw/ff/ product