{"cve":"CVE-2026-16756","nvd":{"published":"2026-07-23T19:16:53.657","modified":"2026-10-24T13:10:00.147","status":"Awaiting Analysis","description":"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.","cvss_v4":{"vector":"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","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://aws.amazon.com/security/security-bulletins/2026-064-aws/","https://crates.io/crates/aws-smithy-http-server/0.66.5","https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-jvxp-qmx7-gjpx"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-16756","score":0.0075,"percentile":0.54679,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-jvxp-qmx7-gjpx","url":"https://osv.dev/vulnerability/GHSA-jvxp-qmx7-gjpx","summary":"Smithy-RS: Allocation of resources without limits in the default aws-smithy-http-server serve() path allows unauthenticated Slowloris denial of service","modified":"2026-07-24T22:56:43.598373Z","packages":[{"ecosystem":"crates.io","name":"aws-smithy-http-server","purl":"pkg:cargo/aws-smithy-http-server","ranges":["<0.66.5"],"fixed":["0.66.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}