{"id":"CVE-2026-127029","aliases":["EUVD-2026-124535","GHSA-gfm6-4qp3-m8ch","UBUNTU-CVE-2026-127029"],"status":"published","title":"Freeradius: stack-based buffer overflow via unbounded eap-sim identity length","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-13","score":0.00602,"percentile":0.49367,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-11-12T16:21:48Z","modified":"2026-11-13T21:05:40Z","affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.12+dfsg-1.3ubuntu5","2.2.8+dfsg-0.1","2.2.8+dfsg-0.1build1","2.2.8+dfsg-0.1build2","2.2.8+dfsg-0.1ubuntu0.1","2.2.8+dfsg-0.1ubuntu0.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.15+dfsg-1ubuntu2","3.0.16+dfsg-1ubuntu2","3.0.16+dfsg-1ubuntu3","3.0.16+dfsg-1ubuntu3.1","3.0.16+dfsg-1ubuntu3.2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.19+dfsg-3","3.0.19+dfsg-3build1","3.0.20+dfsg-1","3.0.20+dfsg-3","3.0.20+dfsg-3build1","3.0.20+dfsg-3ubuntu0.1","3.0.20+dfsg-3ubuntu0.2","3.0.20+dfsg-3ubuntu0.4","3.0.20+dfsg-3ubuntu0.5"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.21+dfsg-2.2","3.0.21+dfsg-3","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu2","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.1","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.2","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.3","3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.4"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.3+dfsg-2","3.2.3+dfsg-2build2","3.2.3+dfsg-2build6","3.2.3+dfsg-2build7","3.2.5+dfsg-3~ubuntu24.04.1","3.2.5+dfsg-3~ubuntu24.04.2","3.2.5+dfsg-3~ubuntu24.04.3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.8+dfsg-1ubuntu2","3.2.8+dfsg-1ubuntu4","3.2.10+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"freeradius","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.7+dfsg-1ubuntu2","3.2.8+dfsg-1ubuntu1","3.2.8+dfsg-1ubuntu2"]}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-127029","tags":["vdb-entry","x_refsource_REDHAT","advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2572339","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://github.com/FreeRADIUS/freeradius-server/commit/064567a08f3b9d9b4863fab6060fafe296ac7de9","tags":["fix","report"]},{"url":"https://github.com/FreeRADIUS/freeradius-server/commit/e415f818dcdf91626e5e7314b3a4f819ab11f572","tags":["fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127029","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gfm6-4qp3-m8ch"},{"url":"https://access.redhat.com/downloads/content/package-browser/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/127xxx/CVE-2026-127029.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-127029","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-127029","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-127029","title":"Freeradius: stack-based buffer overflow via unbounded eap-sim identity length","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-12T16:21:48.973Z","modified":"2026-11-13T22:33:30.507Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-12T17:45:34.63721Z"}],"euvd":[{"id":"EUVD-2026-124535","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-12T16:21:48Z","modified":"2026-11-13T22:33:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-12T20:34:58.63003Z"}],"ghsa":[{"id":"GHSA-gfm6-4qp3-m8ch","title":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber...","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-12T18:31:48Z","modified":"2026-11-12T18:31:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-12T18:42:37.941061Z"}],"nvd":[{"id":"CVE-2026-127029","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-12T17:17:42.97Z","modified":"2026-11-13T23:17:16.967Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-14T01:39:04.309922Z"}],"osv":[{"id":"CVE-2026-127029","title":"Freeradius: stack-based buffer overflow via unbounded eap-sim identity length","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-12T16:21:48.973Z","modified":"2026-11-14T02:47:32.162703984Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-14T03:11:06.681237Z"},{"id":"UBUNTU-CVE-2026-127029","description":"A flaw was found in freeradius's Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. When handling authentication requests, the server copies a client-supplied identity into an internal structure without properly checking its length against a fixed-size buffer. An unauthenticated remote attacker can exploit this issue by sending specially crafted EAP-SIM messages, triggering a stack buffer overflow that crashes the service and results in a Denial of Service (DoS).","status":"published","published":"2026-11-13T00:00:00Z","modified":"2026-11-13T21:05:40.178828075Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-13T21:30:20.292037Z"}]}}