CVE Explorer

CVE-2026-6687

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e0f8ec5097eb1c4db09c2fb58349a8a846f76283c75a7d29c0407459f85e64ac

Known exploited

Not asserted

Disputed

Stale source

Conflicts

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_v5affected
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /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_v5cvss
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-121","description":"CWE-121 Stack-based buffer overflow","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions

{"tags":["product"],"url":"https://elm-chan.org/fsw/ff/"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/cna/references/2

{"tags":["exploit"],"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/adp/0/references/0

{"tags":["technical-description"],"url":"https://github.com/runZeroInc/vulns-2026-fatfs-chance"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/cna/references/1

{"tags":["third-party-advisory"],"url":"https://www.runzero.com/advisories/fatfs-exfat-label-len-of-cve-2026-6687/"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /containers/cna/references/3

{"tags":["third-party-advisory"],"url":"https://www.runzero.com/blog/fatfs-bugs/"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6006221c6ec02818291639efbebaafd22ae2a1fccbcd46884f68a91778574cc7 · sha256:3ccc1bafea3cf755… · /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.

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