{"id":"CVE-2026-67858","aliases":["DEBIAN-CVE-2026-67858","EUVD-2026-52964","GHSA-jh69-g63c-w587","UBUNTU-CVE-2026-67858"],"status":"published","title":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is...","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00857,"percentile":0.58733,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2026-08-04T00:00:00Z","modified":"2026-10-17T13:00:39Z","affected":[{"source":"osv","ecosystem":"Debian:13","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Debian:14","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1build1","1.4.18-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"open62541","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11.1-1","1.4.11.1-1build1"]}],"references":[{"url":"https://github.com/open62541/open62541/issues/8094","tags":["exploit","report"]},{"url":"https://github.com/open62541/open62541/tree/master/examples/discovery","tags":["report"]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c","tags":["report"]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_discovery_mdns.c","tags":["report"]},{"url":"https://github.com/open62541/open62541/blob/master/doc/building.rst","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67858"},{"url":"https://github.com/advisories/GHSA-jh69-g63c-w587"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-67858","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-67858","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67858","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-67858","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-04T00:00:00Z","modified":"2026-08-05T14:33:03.806Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:20:06.562031Z"}],"euvd":[{"id":"EUVD-2026-52964","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-04T00:00:00Z","modified":"2026-08-05T14:33:03Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high"}],"updated_at":"2026-11-02T18:02:10.319044Z"}],"ghsa":[{"id":"GHSA-jh69-g63c-w587","title":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is...","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-05T00:30:39Z","modified":"2026-08-05T15:32:14Z","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-120"],"updated_at":"2026-11-02T15:10:06.632203Z"}],"nvd":[{"id":"CVE-2026-67858","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-04T22:17:16.087Z","modified":"2026-08-31T19:33:11.197Z","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-120"],"updated_at":"2026-11-02T14:12:34.643497Z"}],"osv":[{"id":"DEBIAN-CVE-2026-67858","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-04T22:17:16.087Z","modified":"2026-10-01T03:03:38.955030738Z","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":"2026-11-02T15:46:01.68444Z"},{"id":"UBUNTU-CVE-2026-67858","description":"Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.","status":"published","published":"2026-08-04T22:17:00Z","modified":"2026-10-17T13:00:39.557911832Z","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":"2026-11-02T16:56:53.710209Z"}]}}