{"affected":[{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"freeradius","product":"Red Hat Enterprise Linux 10","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"unknown","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"freeradius","product":"Red Hat Enterprise Linux 6","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"freeradius","product":"Red Hat Enterprise Linux 7","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"freeradius:3.0/freeradius","product":"Red Hat Enterprise Linux 8","source":"CNA: redhat","vendor":"Red Hat","versions":[]},{"defaultStatus":"affected","ecosystem":"https://access.redhat.com/downloads/content/package-browser/","packageName":"freeradius","product":"Red Hat Enterprise Linux 9","source":"CNA: redhat","vendor":"Red Hat","versions":[]}],"cveId":"CVE-2026-127029","cwes":["CWE-787"],"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).","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.5,"severity":"high","source":"CNA: redhat","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":7.5,"severity":"high","source":"NVD: secalert@redhat.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794503863107,"publishedAt":1794500508973,"references":[{"source":"CNA: redhat","tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-127029"},{"source":"CNA: redhat","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2572339"},{"source":"CNA: redhat","tags":[],"url":"https://github.com/FreeRADIUS/freeradius-server/commit/064567a08f3b9d9b4863fab6060fafe296ac7de9"},{"source":"CNA: redhat","tags":[],"url":"https://github.com/FreeRADIUS/freeradius-server/commit/e415f818dcdf91626e5e7314b3a4f819ab11f572"},{"source":"secalert@redhat.com","tags":[],"url":"https://access.redhat.com/security/cve/CVE-2026-127029"},{"source":"secalert@redhat.com","tags":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2572339"},{"source":"secalert@redhat.com","tags":[],"url":"https://github.com/FreeRADIUS/freeradius-server/commit/064567a08f3b9d9b4863fab6060fafe296ac7de9"},{"source":"secalert@redhat.com","tags":[],"url":"https://github.com/FreeRADIUS/freeradius-server/commit/e415f818dcdf91626e5e7314b3a4f819ab11f572"}],"remediation":[{"kind":"workaround","source":"CNA: redhat","text":"Disable the EAP-SIM submodule in the FreeRADIUS configuration if SIM-based authentication is not required:\n\n1. Edit `/etc/raddb/mods-available/eap` (or `/etc/raddb/mods-enabled/eap`) and comment out or remove the `sim` configuration block within the `eap` module definition:\n\n```\n# sim {\n# }\n```\n\n2. Restart the FreeRADIUS service to apply the changes:\n\n```\nsystemctl restart radiusd\n```\n\nWarning: Restarting or reloading the FreeRADIUS service will temporarily interrupt active RADIUS authentication requests. Clients relying on EAP-SIM authentication will no longer be able to authenticate.\n\nAdditionally, restrict RADIUS UDP traffic (ports 1812 and 1813) to trusted Network Access Server (NAS) IP addresses using firewall rules to limit exposure to untrusted networks."}],"revision":"091b64155e7125fa31db37663234b9b66b3f0d70cd5bf4a6b45229c029743ab9","sources":[{"modifiedAt":1794500508973,"name":"CNA: redhat","retrievedAt":1794503443978,"url":"https://www.cve.org/CVERecord?id=CVE-2026-127029"},{"modifiedAt":1794503863107,"name":"NVD","retrievedAt":1794507524470,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127029"}],"ssvc":null,"status":"published","title":"Freeradius: stack-based buffer overflow via unbounded eap-sim identity length","updatedAt":1794507524470}