{"id":"CVE-2026-18140","revision":"a818c7bf2d6648aaa30637dbed1c31b5","records":[{"revision":"a818c7bf2d6648aaa30637dbed1c31b5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-18140","aliases":[],"title":"Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers","description":"Uncontrolled recursion in the unknown-key skip path of the aws-smithy-json runtime crate before 0.62.7, which the smithy-rs code generator invokes from every generated struct deserializer, might allow remote unauthenticated users to cause a denial of service (process abort via stack exhaustion) via a single small HTTP request containing deeply nested JSON to a smithy-rs generated server.\n\n\n\nTo remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild.","state":0,"publishedAt":"2026-07-30T18:34:04.099+00:00","modifiedAt":"2026-07-30T19:12:50.56+00:00","affected":[{"ecosystem":"Vendor product","name":"aws-smithy-json","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"AWS\",\n                    \"product\": \"aws-smithy-json\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.32.0\",\n                            \"lessThanOrEqual\": \"0.62.6\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"HIGH"},{"system":"CVSS 4.0","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,"severity":"HIGH"}],"references":["https://crates.io/crates/aws-smithy-json/0.62.7","https://aws.amazon.com/security/security-bulletins/2026-067-aws/","https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-18140","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-18140","identifiers":["CVE-2026-18140"]},"retained":false,"historicalAffected":[]}],"coverage":[]}