{"id":"CVE-2026-1301","aliases":["EUVD-2026-5530","GHSA-c8xh-89h3-73pj"],"status":"published","title":"Out-of-bounds Write in o6 Automation GmbH Open62541","description":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.","severity":{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00381,"percentile":0.32574,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-02-05T19:09:37Z","modified":"2026-06-17T10:15:28Z","products":[{"vendor":"o6 automation gmbh","product":"open62541"}],"references":[{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-03","tags":["government-resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1301"},{"url":"https://github.com/advisories/GHSA-c8xh-89h3-73pj"}],"sources":{"cve":[{"id":"CVE-2026-1301","title":"Out-of-bounds Write in o6 Automation GmbH Open62541","description":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.","status":"published","published":"2026-02-05T19:09:37.387Z","modified":"2026-02-05T20:23:12.378Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:20:01.271368Z"}],"euvd":[{"id":"EUVD-2026-5530","description":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.","status":"published","published":"2026-02-05T19:09:37Z","modified":"2026-02-05T20:23:12Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:48:43.229255Z"}],"ghsa":[{"id":"GHSA-c8xh-89h3-73pj","title":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write...","description":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.","status":"published","published":"2026-02-05T21:32:42Z","modified":"2026-02-05T21:32:48Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:06:04.029234Z"}],"nvd":[{"id":"CVE-2026-1301","description":"In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.","status":"published","published":"2026-02-05T19:15:55.983Z","modified":"2026-06-17T10:15:28.773Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:12:05.149641Z"}]}}