CVE-2026-18140
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | aws-smithy-json | 0.32.0 <= 0.62.6 | affected |
Weaknesses
- CWE-674: CWE-674: Uncontrolled Recursion
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
- https://crates.io/crates/aws-smithy-json/0.62.7
- https://aws.amazon.com/security/security-bulletins/2026-067-aws/
- https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56
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