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CVE-2026-15957— Uncontrolled recursion in smithy-rs generated JSON, CBOR, and XML deserializers allows unauthenticated remote denial of service via recursive shapes

Quick assessment

Affected
AWS aws-sdk-rust
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS aws-sdk-rust是AWS公司开源的一款AWS的软件开发工具包。 aws-sdk-rust release-2026-06-02之前版本存在资源管理错误漏洞，该漏洞源于Amazon smithy-rs代码生成发出的JSON、CBOR和XML反序列化函数中存在不受控制的递归，可能导致远程攻击者通过包含深度嵌套数据的请求造成拒绝服务。

CVSS 7.5 · High EPSS 0.75% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
AWS aws-sdk-rust < release-2026-06-02 affected
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I. Basic Information for CVE-2026-15957

Vulnerability Information
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Vulnerability Title
Uncontrolled recursion in smithy-rs generated JSON, CBOR, and XML deserializers allows unauthenticated remote denial of service via recursive shapes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
aws-sdk-rust 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS aws-sdk-rust是AWS公司开源的一款AWS的软件开发工具包。 aws-sdk-rust release-2026-06-02之前版本存在资源管理错误漏洞，该漏洞源于Amazon smithy-rs代码生成发出的JSON、CBOR和XML反序列化函数中存在不受控制的递归，可能导致远程攻击者通过包含深度嵌套数据的请求造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS aws-sdk-rust 0 ~ release-2026-06-02 -

II. Public POCs for CVE-2026-15957

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III. Intelligence Information for CVE-2026-15957

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Vendor Advisories for CVE-2026-15957 (2)

Vendor Pages for CVE-2026-15957 (1)

IV. Related Vulnerabilities

Same product: aws-sdk-rust
Same vendor: AWS
Same weakness: CWE-770

V. Comments for CVE-2026-15957

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