{"id":"CVE-2026-15957","revision":null,"records":[{"revision":"20c6203b5b2c4810bdbd39e19b56028e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-15957","aliases":[],"title":"Uncontrolled recursion in smithy-rs generated JSON, CBOR, and XML deserializers allows unauthenticated remote denial of service via recursive shapes","description":"Smithy-RS is a Rust code generation and runtime framework that generates HTTP clients and servers from Smithy interface definitions, powering the AWS SDK for Rust and custom service implementations.\n\n\n\nUncontrolled recursion in the JSON, CBOR, and XML deserializer functions emitted by Amazon smithy-rs code generation could allow remote attackers to cause a denial of service (process abort via stack exhaustion) via a small request containing deeply nested data for a recursive model shape to a generated SDK or server.\n\n\n\nTo mitigate this issue, users should upgrade to aws-sdk-rust release-2026-06-02 or later. Users building custom servers with smithy-rs codegen should regenerate from smithy-rs release-2026-06-01 or later.","state":0,"publishedAt":"2026-07-21T19:33:55.409+00:00","modifiedAt":"2026-10-20T18:11:08.949+00:00","affected":[{"ecosystem":"Vendor product","name":"aws-sdk-rust","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"AWS\",\n                    \"product\": \"aws-sdk-rust\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"release-2026-06-02\",\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://github.com/awslabs/aws-sdk-rust/releases/tag/release-2026-06-02","https://aws.amazon.com/security/security-bulletins/2026-061-aws/","https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-4f2p-7j38-4xrg"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-15957","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-15957","identifiers":["CVE-2026-15957"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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