{"id":"CVE-2026-18140","revision":"ffae4ac5746a44d29d603a9683e42212","records":[{"revision":"ffae4ac5746a44d29d603a9683e42212","observedAt":"2026-10-25T05:17:25.909+00:00","statement":{"source":"nvd","id":"CVE-2026-18140","aliases":[],"title":"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…","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":"2026-07-30T19:17:26.457+00:00","modifiedAt":"2026-10-23T22:10:00.16+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5 · Secondary","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"}],"references":["https://aws.amazon.com/security/security-bulletins/2026-067-aws/","https://crates.io/crates/aws-smithy-json/0.62.7","https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18140","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-674"],"productCriteria":["cpe:2.3:a:amazon:aws-smithy-json:*:*:*:*:*:rust:*:*"],"sourceDates":{"published":"2026-07-30T19:17:26.457","lastModified":"2026-10-23T22:10:00.160"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-18140","identifiers":["CVE-2026-18140"]},"retained":false,"historicalAffected":[]}],"coverage":[]}