CVEvulnerability
CVE-2026-6687
7.6 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-01
- Last modified
- 2026-10-25
- Assigner
- 44488dab-36db-4358-99f9-bc116477f914
- CVSS 3.1 (44488dab-36db-4358-99f9-bc116477f914)
- 7.6 HIGH — CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-121
Description
FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). 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.
Affected configurations
• elm-chan fatfs (<= r0.16)
Related
Weakness · CWE (1)
- CWE-121 Stack-based Buffer Overflow weakness
References
- https://elm-chan.org/fsw/ff/ Product
- https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party Advisory, Exploit
- https://www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/ Third Party Advisory
- https://www.runzero.com/blog/fatfs-bugs/ Third Party Advisory, Exploit
- https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party Advisory, Exploit