PT-2026-66566 · Aws · Aws-Smithy-Json

CVE-2026-18140 · Published 2026-07-30 · Updated 2026-07-30

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

To remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild.

Fix

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

CVE-2026-18140

Affected Products

Aws-Smithy-Json

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-18140 · Security Note
• https://aws.amazon.com/security/security-bulletins/2026-067-aws · Vendor Advisory
• https://crates.io/crates/aws-smithy-json/0.62.7 · Patch
• https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56 · Note