{"schemaVersion":3,"id":"CVE-2026-7426","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-04-29T18:53:52.187Z","modified":"2026-04-29T22:14:34.199Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.1,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.004,"percentile":0.32681,"severity":"low","asOf":"2026-10-18T00:00:00.000Z","change":{"pp":0.15400000000000003,"baselineDate":"2026-09-18T00:00:00.000Z","baselineScore":0.00246},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.004,"percentile":0.32681}],"last30":[{"date":"2026-09-18T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.004,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.004,"percentile":0.32681}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"amazon","product":"freertos-plus-tcp","name":"freertos-plus-tcp","label":"freertos-plus-tcp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, < 4.2.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0, < 4.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 4.2.6 | ≥ 4.3.0, < 4.4.1","eol":null,"hubHref":"/vendor/amazon/freertos-plus-tcp"},{"vendor":"aws","product":"freertos-plus-tcp","name":"FreeRTOS-Plus-TCP","label":"freertos-plus-tcp","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, < 4.2.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.3.0, < 4.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 4.2.6 | ≥ 4.3.0, < 4.4.1","eol":null,"hubHref":"/vendor/aws/freertos-plus-tcp"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1","label":"github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1","hostname":"github.com","tags":["Patch","Release Notes"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6","label":"github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6","hostname":"github.com","tags":["Patch","Release Notes"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-023-aws/","label":"aws.amazon.com/security/security-bulletins/2026-023-aws/","hostname":"aws.amazon.com","tags":["Vendor Advisory"]},{"url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x","label":"github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x","hostname":"github.com","tags":["Third Party Advisory","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-04-29T18:53:52.187Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-29T22:14:34.199Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T04:40:42.158Z","stale":false,"partial":false}}