CVE-2026-18140

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.

References

https://github.com/smithy-lang/smithy-rs/security/advisories/GHSA-8ffr-xgwf-xj56

https://crates.io/crates/aws-smithy-json/0.62.7

https://aws.amazon.com/security/security-bulletins/2026-067-aws/

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS