CVE-2026-18140: CWE-674: Uncontrolled Recursion in AWS aws-smithy-json
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.
CVE-2026-18140: CWE-674: Uncontrolled Recursion in AWS aws-smithy-json
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. To remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-07-28T18:30:40.451Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-067-aws/","vendor":"AWS"}]
Threat ID: 6a6ba4a59c2644c7f88ded84
Added to database: 07/30/2026, 19:23:17 UTC
Last updated: 07/30/2026, 19:23:17 UTC
Views: 1
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