CVE-2026-7422
Full vulnerability record from the local CVENow database.
Description
Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint. To mitigate this issue, users should upgrade to the fixed version when available.
Severity
HIGH
CVSS score
7.1
(v4.0)
Vulnerability status
Analyzed
Source identifier
ff89ba41-3aa1-4d27-914a-91399e9639e5
Published
2026-04-29 19:16:26.487000
Last modified
2026-10-26 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-7422",
"sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"published": "2026-04-29T19:16:26.487",
"lastModified": "2026-10-26T20:10:00.160",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint.\n\n\n\nTo mitigate this issue, users should upgrade to the fixed version when available."
},
{
"lang": "es",
"value": "Validación de paquetes insuficiente en FreeRTOS-Plus-TCP anterior a V4.2.6 y V4.4.1 permite a un actor de red adyacente eludir toda validación de suma de comprobación y de tamaño mínimo al suplantar la dirección MAC de origen de Ethernet para que coincida con uno de los puntos finales registrados del propio dispositivo, porque el mecanismo de detección de bucle invertido omite toda validación de entrada para paquetes cuya MAC de origen coincide con un punto final local.\n\nPara mitigar este problema, los usuarios deben actualizar a la versión corregida cuando esté disponible."
}
],
"affected": [
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"affectedData": [
{
"vendor": "AWS",
"product": "FreeRTOS-Plus-TCP",
"defaultStatus": "unaffected",
"collectionURL": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP",
"versions": [
{
"version": "4.0.0",
"lessThan": "4.2.6",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.3.0",
"lessThan": "4.4.1",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.2.6",
"status": "unaffected"
},
{
"version": "4.4.1",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary",
"cvssData": {
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"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"attackVector": "ADJACENT",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"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"
}
}
],
"cvssMetricV31": [
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"attackVector": "ADJACENT_NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-04-29T19:07:24.986831Z",
"id": "CVE-2026-7422",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-290"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.0.0",
"versionEndExcluding": "4.2.6",
"matchCriteriaId": "DE7A5C38-9CEA-461B-9272-3B8BFC06BFEE"
},
{
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"criteria": "cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.3.0",
"versionEndExcluding": "4.4.1",
"matchCriteriaId": "375C7032-9CFB-480C-BFFA-029C985A82B7"
}
]
}
]
}
],
"references": [
{
"url": "https://aws.amazon.com/security/security-bulletins/2026-021-aws/",
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6",
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"tags": [
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]
},
{
"url": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1",
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"tags": [
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]
},
{
"url": "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9",
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"tags": [
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"Vendor Advisory"
]
}
]
}