{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71254","assignerOrgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","state":"PUBLISHED","assignerShortName":"TuranSec","dateReserved":"2026-08-05T11:43:52.777Z","datePublished":"2026-08-05T11:44:20.214Z","dateUpdated":"2026-08-10T11:46:13.975Z"},"containers":{"cna":{"title":"nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()","descriptions":[{"lang":"en","value":"nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus server-side handle_read_file_record function (FC 0x14, Read File Record) in nanomodbus.c. The function validates that the total request size does not exceed 245 bytes and that each sub-request's record_length is at most 124, but it never validates the CUMULATIVE response size across all sub-requests before processing them.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus server-side handle_read_file_record function (FC 0x14, Read File Record) in nanomodbus.c. The function validates that the total request size does not exceed 245 bytes and that each sub-request's record_length is at most 124, but it never validates the CUMULATIVE response size across all sub-requests before processing them.</p>"}]}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-787","cweId":"CWE-787","type":"CWE"}]}],"affected":[{"vendor":"debevv","product":"nanoMODBUS","programFiles":["nanomodbus.c"],"versions":[{"version":"0","lessThanOrEqual":"1.23.0","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"references":[{"url":"https://github.com/debevv/nanoMODBUS","tags":["third-party-advisory"]},{"url":"https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c","tags":["third-party-advisory"]}],"credits":[{"lang":"en","value":"Shukhratbek Uraiimov","type":"finder"}],"providerMetadata":{"orgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","shortName":"TuranSec","dateUpdated":"2026-08-10T11:46:13.975Z"},"source":{"discovery":"EXTERNAL"},"datePublic":"2026-08-05T11:44:20.214Z"},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-05T12:29:36.579901Z","id":"CVE-2026-71254","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-05T12:29:59.671Z"}}]}}