FKIE_CVE-2026-16756
Vulnerability from fkie_nvd - Published: 2026-07-23 19:16 - Updated: 2026-10-24 13:10
Severity
Summary
Missing connection and header-read timeouts and the absence of a concurrent-connection cap in the default serve() path of Amazon aws-smithy-http-server might allow remote attackers to cause a denial of service by opening many connections and sending partial requests that are never completed, exhausting server sockets and tasks.
To mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "aws-smithy-http-server",
"vendor": "AWS",
"versions": [
{
"lessThanOrEqual": "0.66.4",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Missing connection and header-read timeouts and the absence of a concurrent-connection cap in the default serve() path of Amazon aws-smithy-http-server might allow remote attackers to cause a denial of service by opening many connections and sending partial requests that are never completed, exhausting server sockets and tasks.\n\n\n\nTo mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later."
},
{
"lang": "es",
"value": "La falta de tiempos de espera para la conexi\u00f3n y la lectura de encabezados y la ausencia de un l\u00edmite de conexiones concurrentes en la ruta \u2019serve()\u2019 predeterminada de Amazon aws-smithy-http-server podr\u00eda permitir a atacantes remotos causar una denegaci\u00f3n de servicio al abrir muchas conexiones y enviar solicitudes parciales que nunca se completan, agotando los sockets del servidor y las tareas.\n\nPara mitigar este problema, los usuarios deber\u00edan actualizar a aws-smithy-http-server 0.66.5 o posterior."
}
],
"id": "CVE-2026-16756",
"lastModified": "2026-10-24T13:10:00.147",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-16756",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-12T19:03:10.789235Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-23T19:16:53.657",
"references": [
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"url": "https://aws.amazon.com/security/security-bulletins/2026-064-aws/"
},
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"url": "https://crates.io/crates/aws-smithy-http-server/0.66.5"
},
{
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"url": "https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-jvxp-qmx7-gjpx"
}
],
"sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
"type": "Secondary"
}
]
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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