{"id":"CVE-2026-77236","aliases":["EUVD-2026-64017","GHSA-vq2f-9qj3-jj2m"],"status":"published","title":"Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel","description":"Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.","severity":{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00162,"percentile":0.05397,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-08-21T17:47:49Z","modified":"2026-11-04T02:47:51Z","products":[{"vendor":"amazon","product":"freertos"},{"vendor":"freertos","product":"freertos-kernel"}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-086-aws/","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1","tags":["patch","Release Notes","fix"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-vq2f-9qj3-jj2m","tags":["third-party-advisory","Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77236.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77236","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-77236","title":"Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel","description":"Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.","status":"published","published":"2026-08-21T17:47:49.957Z","modified":"2026-08-21T20:15:07.195Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H","level":"high","assessor":"cna"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:20:15.712761Z"}],"euvd":[{"id":"EUVD-2026-64017","description":"Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.","status":"published","published":"2026-08-21T17:47:49Z","modified":"2026-08-21T20:15:07Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H","level":"high"}],"updated_at":"2026-11-02T18:01:36.844009Z"}],"nvd":[{"id":"CVE-2026-77236","description":"Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.","status":"published","published":"2026-08-21T18:16:51.8Z","modified":"2026-10-14T19:10:00.297Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H/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":"high","assessor":"secondary"},{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:12:40.665005Z"}],"osv":[{"id":"CVE-2026-77236","title":"Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel","description":"Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.","status":"published","published":"2026-08-21T17:47:49.957Z","modified":"2026-11-06T10:46:34.157309179Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T11:08:47.346964Z"}]}}