{"id":"CVE-2026-7423","summary":"Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP","details":"Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available.","aliases":["GHSA-7r59-2pgv-9v2r"],"modified":"2026-07-15T01:48:51.705553810Z","published":"2026-04-29T18:36:28.353Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7423.json","cna_assigner":"AMZN","cwe_ids":["CWE-191"]},"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-021-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7423.json"},{"type":"ADVISORY","url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-7r59-2pgv-9v2r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7423"},{"type":"FIX","url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6"},{"type":"FIX","url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1"},{"type":"PACKAGE","url":"https://github.com/FreeRTOS/FreeRTOS-Plus-TCP"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freertos/freertos-plus-tcp","events":[{"introduced":"3e26a338bd1547bbaa6f4965def1a4b152620d3e"},{"fixed":"5986530664073a609e634bde63dd9bff37e725f0"},{"introduced":"dd4d689acc04015e5a2a3ef2cebb6725f55c60be"},{"fixed":"c12361095aca68aeed858f45d14395fbffa92c0d"}],"database_specific":{"extracted_events":[{"introduced":"4.0.0"},{"fixed":"4.2.6"},{"introduced":"4.3.0"},{"fixed":"4.4.1"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*"}}],"versions":["V4.2.5","V4.4.0","V4.2.4","V4.2.3","V4.2.2","V4.2.1","V4.2.0","V4.0.0-appsec"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7423.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}