{"id":"CVE-2026-48503","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-48503","generatedAt":"2026-10-28T04:13:40.227Z","title":"The oversized response can include stale bytes from the reused connection buffer after the requested file contents, disclosing prior response data and protocol fragments to an unauthenticated remote client when the file service is enabled.","description":"libIEC61850 is an open-source implementation of IEC 61850 client and server protocols including MMS, GOOSE, Sampled Values, and R-Session. Prior to 1.6.2, the MMS file service in src/mms/iso_mms/server/mms_file_service.c accepts an out-of-range initialPosition in fileOpen and stores it in the file-read state. The fileRead path then subtracts the larger read position from the file size using unsigned arithmetic and fails to limit the response to the actual FileSystem_readFile return value. The oversized response can include stale bytes from the reused connection buffer after the requested file contents, disclosing prior response data and protocol fragments to an unauthenticated remote client when the file service is enabled. This issue is fixed in version 1.6.2.","published":"2026-10-16T16:18:12.000Z","lastModified":"2026-10-16T20:04:30.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"cwe":["CWE-191","CWE-200","CWE-252"],"affected":[],"epss":{"score":0.00458,"percentile":0.3951,"date":"2026-10-27","history":[{"date":"2026-10-17","score":0.00458,"percentile":0.38259}]},"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 (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-16T16:18:12.000Z","detail":{"score":"7.5","severity":"HIGH","publishedAt":"2026-10-16T16:18:11.793Z"},"summary":"New CVE, high severity (CVSS 7.5)."}],"references":[{"url":"https://github.com/mz-automation/libiec61850/commit/bba5bf2fab6d7ac88f5accb4c9e90b123436ebf2","source":"security-advisories@github.com"},{"url":"https://github.com/mz-automation/libiec61850/releases/tag/v1.6.2","source":"security-advisories@github.com"},{"url":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-4c8m-jr3r-h8j2","source":"security-advisories@github.com"},{"url":"https://github.com/mz-automation/libiec61850/security/advisories/GHSA-4c8m-jr3r-h8j2","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-48503","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."}