CVE-2026-7424
Full vulnerability record from the local CVENow database.
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. The issue is present whenever DHCPv6 is enabled. To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.
Severity
HIGH
CVSS score
7.2
(v4.0)
Vulnerability status
Analyzed
Source identifier
ff89ba41-3aa1-4d27-914a-91399e9639e5
Published
2026-04-29 19:16:26.743000
Last modified
2026-10-26 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-7424",
"sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"published": "2026-04-29T19:16:26.743",
"lastModified": "2026-10-26T20:10:00.160",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Un desbordamiento negativo de enteros en el analizador de subopciones DHCPv6 en FreeRTOS-Plus-TCP anterior a las versiones V4.4.1 y V4.2.6 permite a un actor de red adyacente corromper la asignación de direcciones IPv6 del dispositivo, la configuración DNS y los tiempos de concesión, y causar una denegación de servicio (congelación permanente de la tarea IP que requiere un reinicio de hardware) mediante el envío de un único paquete DHCPv6 manipulado.\n\nEl problema está presente siempre que DHCPv6 esté habilitado.\n\nPara mitigar este problema, los usuarios deben actualizar a la versión V4.2.6 o V4.4.1 o posterior."
}
],
"affected": [
{
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"affectedData": [
{
"vendor": "AWS",
"product": "FreeRTOS-Plus-TCP",
"defaultStatus": "unaffected",
"collectionURL": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP",
"versions": [
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"lessThan": "4.2.6",
"versionType": "semver",
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{
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{
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"baseScore": 7.2,
"baseSeverity": "HIGH",
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"attackComplexity": "LOW",
"attackRequirements": "NONE",
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"vulnIntegrityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
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"cvssMetricV31": [
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"scope": "UNCHANGED",
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"availabilityImpact": "HIGH"
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"ssvcV203": [
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"id": "CVE-2026-7424",
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{
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"configurations": [
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"cpeMatch": [
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"references": [
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"url": "https://aws.amazon.com/security/security-bulletins/2026-022-aws/",
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
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}