Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP_CVE-2026-7424

{
    "lastseen": "",
    "description": "Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet.\n\n\n\n\n\n\n\n\nThe issue is present whenever DHCPv6 is enabled.\n\n\n\n\n\n\n\n\nTo mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.",
    "published": "2026-04-29T18:51:28.385Z",
    "modified": "2026-04-29T19:09:03.842Z",
    "type": "cve",
    "title": "Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP",
    "source": "AMZN",
    "references": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1\nhttps://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6\nhttps://aws.amazon.com/security/security-bulletins/2026-022-aws/",
    "id": "CVE-2026-7424",
    "bulletinFamily": "",
    "cwe": [
        "CWE-191"
    ],
    "cvelist": null,
    "sourceData": "AWS FreeRTOS-Plus-TCP 4.0.0\nAWS FreeRTOS-Plus-TCP 4.3.0",
    "sourceHref": "",
    "cvss": {
        "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",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "FreeRTOS-Plus-TCP",
    "version": "4.0.0",
    "vendor": "AWS",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}