{"id":"CVE-2026-7426","aliases":["EUVD-2026-26284","GHSA-97qg-4359-xm3x"],"status":"published","title":"Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP","description":"Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","severity":{"version":"4.0","score":6.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00246,"percentile":0.16023,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-04-29T18:53:52Z","modified":"2026-10-28T02:30:24Z","products":[{"vendor":"amazon","product":"freertos-plus-tcp"},{"vendor":"aws","product":"freertos-plus-tcp"}],"references":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1","tags":["patch","Release Notes","fix"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6","tags":["patch","Release Notes","fix"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-023-aws/","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x","tags":["third-party-advisory","Patch","Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7426.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7426","tags":["advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-7426","title":"Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP","description":"Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","status":"published","published":"2026-04-29T18:53:52.187Z","modified":"2026-04-29T22:14:34.199Z","cvss":[{"version":"4.0","score":6.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:20:06.216584Z"}],"euvd":[{"id":"EUVD-2026-26284","description":"Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","status":"published","published":"2026-04-29T18:53:52Z","modified":"2026-04-29T22:14:34Z","cvss":[{"version":"4.0","score":6.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:05:19.555165Z"}],"nvd":[{"id":"CVE-2026-7426","description":"Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","status":"published","published":"2026-04-29T20:16:32.143Z","modified":"2026-10-26T20:10:00.16Z","cvss":[{"version":"4.0","score":6.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/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"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:12:16.626888Z"}],"osv":[{"id":"CVE-2026-7426","title":"Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP","description":"Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","status":"published","published":"2026-04-29T18:53:52.187Z","modified":"2026-10-28T02:30:24.889134442Z","cvss":[{"version":"4.0","score":6.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:45:16.365946Z"}]}}