VDB
CVE-2026-18140
CVE-2026-18140
PUBLISHED
CVSS 7.5 HIGH
Reported by AMZN · Published July 30, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| AWS | aws-smithy-json | 0.32.0 |
| aws | aws-smithy-json | 0.32.0 |
| AWS | aws-smithy-json | 0.32.0 |
Timeline
- Jul 30, 2026 CVE Published
- Jul 31, 2026 Coalition ESS Score
- Aug 3, 2026 Security Advisory
- Aug 7, 2026 EPSS Score
- Aug 10, 2026 CVE Updated
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score