Description
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.
Uncontrolled recursion in the JSON, CBOR, and XML deserializer functions emitted by Amazon smithy-rs code generation could allow remote attackers to cause a denial of service (process abort via stack exhaustion) via a small request containing deeply nested data for a recursive model shape to a generated SDK or server.
To mitigate this issue, users should upgrade to aws-sdk-rust release-2026-06-02 or later. Users building custom servers with smithy-rs codegen should regenerate from smithy-rs release-2026-06-01 or later.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AWS | aws-sdk-rust | < release-2026-06-02 | release-2026-06-02 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | amazon-efs-utils | 3.1.3-1.amzn2023 | ALAS2023-2026-3333 |
| Amazon Linux 2023 | network-flow-monitor-agent | 1.1.8-1.amzn2023.0.1 | ALAS2023-2026-3116 |
| Amazon Linux 2 | amazon-efs-utils | 3.1.3-1.amzn2 | ALAS2-2026-4044 |
Advisories 3
- ALAS2-2026-4044 Important: amazon-efs-utils security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 28, 2026
- ALAS2023-2026-3333 Important: amazon-efs-utils security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2023-2026-3116 Important: network-flow-monitor-agent security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 23, 2026