CVE Explorer
CVE-2026-6682
In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). 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). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"FatFs","vendor":"ChaN","versions":[{"lessThanOrEqual":"R0.16","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"PHYSICAL","availabilityImpact":"HIGH","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-190","description":"CWE-190 Integer overflow or wraparound","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"tags":["product"],"url":"https://elm-chan.org/fsw/ff/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/references/2
{"tags":["technical-description"],"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/adp/0/references/0
{"tags":["third-party-advisory"],"url":"https://www.runzero.com/advisories/fatfs-fat32-int-of-mnt-cve-2026-6682/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/references/3
{"tags":["third-party-advisory"],"url":"https://www.runzero.com/blog/fatfs-bugs/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:0dae43ce570d1a0aca3608b43e08ae501c7ba54a0be0efb290886d2112bde684 · sha256:fc7a8d8bb4c11564… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.