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CVE-2026-18140 is a high-severity denial of service vulnerability in the aws-smithy-json runtime crate before version 0.62.7. It involves uncontrolled recursion triggered by deeply nested JSON in the unknown-key skip path of smithy-rs generated struct deserializers. Remote unauthenticated attackers can exploit this by sending a single HTTP request with crafted JSON to exhaust the stack and cause process abort. AWS manages remediation for this cloud-hosted service, and users should upgrade to version 0.62.7 or later and rebuild to mitigate the risk. Join the discussion | CVE Database V5 | 08/20/2026, 21:35:57 UTC Added: 07/30/2026, 19:23:17 UTC |
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