{"id":"CVE-2026-6687","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-6687","generatedAt":"2026-10-28T04:44:51.903Z","title":"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.","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.","published":"2026-07-01T15:17:13.000Z","lastModified":"2026-10-25T17:10:00.000Z","status":"Analyzed","sourceIdentifier":"44488dab-36db-4358-99f9-bc116477f914","cvss":{"version":"3.1","score":7.6,"severity":"HIGH","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-121"],"affected":["elm-chan/fatfs"],"epss":{"score":0.00348,"percentile":0.28289,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://elm-chan.org/fsw/ff/","tags":["Product"],"source":"44488dab-36db-4358-99f9-bc116477f914"},{"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance","tags":["Third Party Advisory","Exploit"],"source":"44488dab-36db-4358-99f9-bc116477f914"},{"url":"https://www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/","tags":["Third Party Advisory"],"source":"44488dab-36db-4358-99f9-bc116477f914"},{"url":"https://www.runzero.com/blog/fatfs-bugs/","tags":["Third Party Advisory","Exploit"],"source":"44488dab-36db-4358-99f9-bc116477f914"},{"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance","tags":["Third Party Advisory","Exploit"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-6687","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}