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.
Advisories

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Fixes

Solution

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Workaround

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History

Thu, 30 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 30 Jul 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers
First Time appeared Aws
Aws aws-smithy-json
Weaknesses CWE-674
CPEs cpe:2.3:a:aws:aws-smithy-json:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws aws-smithy-json
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-07-30T19:12:50.560Z

Reserved: 2026-07-28T18:30:40.451Z

Link: CVE-2026-18140

cve-icon Vulnrichment

Updated: 2026-07-30T19:12:45.317Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-30T19:17:26.457

Modified: 2026-08-10T20:04:05.790

Link: CVE-2026-18140

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T10:45:03Z

Weaknesses