{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16756","assignerOrgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","state":"PUBLISHED","assignerShortName":"AMZN","dateReserved":"2026-07-23T13:10:13.818Z","datePublished":"2026-07-23T18:32:53.792Z","dateUpdated":"2026-08-12T19:03:13.246Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","shortName":"AMZN","dateUpdated":"2026-07-23T18:35:37.941Z"},"title":"Allocation of resources without limits in the default aws-smithy-http-server serve() path allows unauthenticated Slowloris denial of service","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-770","description":"CWE-770 Allocation of resources without limits or throttling","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-469","descriptions":[{"lang":"en","value":"CAPEC-469 HTTP DoS"}]}],"affected":[{"vendor":"AWS","product":"aws-smithy-http-server","versions":[{"status":"affected","version":"0","lessThanOrEqual":"0.66.4","versionType":"custom"}],"defaultStatus":"unaffected"}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:aws:aws-smithy-http-server:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndIncluding":"0.66.4"}]}]}],"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>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.</p><p>To mitigate this issue, users should upgrade to aws-smithy-http-server 0.66.5 or later.</p>"}]}],"references":[{"url":"https://crates.io/crates/aws-smithy-http-server/0.66.5","tags":["release-notes","patch"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-064-aws/","tags":["vendor-advisory"]},{"url":"https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-jvxp-qmx7-gjpx","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"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"}}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-12T19:03:10.789235Z","id":"CVE-2026-16756","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-12T19:03:13.246Z"}}]}}