GHSA-8ffr-xgwf-xj56

Source

https://github.com/advisories/GHSA-8ffr-xgwf-xj56

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-8ffr-xgwf-xj56/GHSA-8ffr-xgwf-xj56.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-8ffr-xgwf-xj56

Aliases

CVE-2026-18140

Published

2026-10-02T22:44:52Z

Modified

2026-10-02T23:00:21Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
8.7 (High) CVSS_V4 - 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 CVSS Calculator

Summary

aws-smithy-json: Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers

Details

Summary

Smithy-RS is a Rust code generation and runtime framework that generates HTTP clients and servers from Smithy interface definitions, powering the AWS SDK for Rust and custom service implementations. An issue exists which allows uncontrolled recursion in the unknown-key skip path of the Amazon aws-smithy-json runtime crate in versions 0.62.6 and earlier.

Impact

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.

Impacted versions: aws-smithy-json <= 0.62.6

Patches

This issue has been addressed in aws-smithy-json version 0.62.7. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

There are no workarounds besides updating to the patched version.

References

If you have any questions or comments about this advisory, AWS asks that you contact [AWS/Amazon] Security via their vulnerability reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Database specific

{
    "cwe_ids": [
        "CWE-674"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-02T22:44:52Z",
    "nvd_published_at": "2026-07-30T19:17:26Z",
    "severity": "HIGH"
}

References

Affected packages

crates.io / aws-smithy-json

Package

Name: aws-smithy-json; View open source insights on deps.dev
Purl: pkg:cargo/aws-smithy-json

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.62.7

Database specific

last_known_affected_version_range

"<= 0.62.6"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-8ffr-xgwf-xj56/GHSA-8ffr-xgwf-xj56.json"