{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "4.0.0"
              },
              {
                "fixed": "4.2.6"
              },
              {
                "introduced": "4.3.0"
              },
              {
                "fixed": "4.4.1"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "3e26a338bd1547bbaa6f4965def1a4b152620d3e"
            },
            {
              "fixed": "5986530664073a609e634bde63dd9bff37e725f0"
            },
            {
              "introduced": "dd4d689acc04015e5a2a3ef2cebb6725f55c60be"
            },
            {
              "fixed": "c12361095aca68aeed858f45d14395fbffa92c0d"
            }
          ],
          "repo": "https://github.com/freertos/freertos-plus-tcp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7r59-2pgv-9v2r"
  ],
  "database_specific": {
    "cna_assigner": "AMZN",
    "cwe_ids": [
      "CWE-191"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7423.json"
  },
  "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.",
  "id": "CVE-2026-7423",
  "modified": "2026-07-15T01:48:51.705553810Z",
  "published": "2026-04-29T18:36:28.353Z",
  "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"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP"
}