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CVE-2026-6966— Signature Threshold Bypass in awslabs/tough Delegated Roles

Quick assessment

Affected
AWS tough
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.

Amazon tough是美国亚马逊（Amazon）公司的 一个The Update Framework（TUF） 存储库的 Rust 客户端库。 Amazon tough tough-v0.22.0之前版本存在数据伪造问题漏洞，该漏洞源于委托角色验证中加密签名唯一性验证不当，可能导致远程经过身份验证的用户通过复制有效签名绕过TUF签名阈值要求，导致客户端接受伪造的委托角色元数据。

CVSS 5.3 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2026-6966

Vulnerability Information
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Vulnerability Title
Signature Threshold Bypass in awslabs/tough Delegated Roles
Source: CVE Program / CVE List V5
Vulnerability Description
Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata. We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon tough 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon tough是美国亚马逊（Amazon）公司的 一个The Update Framework（TUF） 存储库的 Rust 客户端库。 Amazon tough tough-v0.22.0之前版本存在数据伪造问题漏洞，该漏洞源于委托角色验证中加密签名唯一性验证不当，可能导致远程经过身份验证的用户通过复制有效签名绕过TUF签名阈值要求，导致客户端接受伪造的委托角色元数据。
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 tough - -
AWS tuftool - -

II. Public POCs for CVE-2026-6966

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III. Intelligence Information for CVE-2026-6966

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Vendor Advisories for CVE-2026-6966 (2)

Vendor Pages for CVE-2026-6966 (3)

Other References for CVE-2026-6966 (1)

Same Patch Batch · AWS · 2026-04-24 · 5 CVEs total

CVE-2026-6911 9.8 CRITICAL Authentication Bypass via Missing JWT Signature Verification in AWS Ops Wheel
CVE-2026-6912 8.8 HIGH Privilege Escalation via Self-Writable Cognito Custom Attribute in AWS Ops Wheel
CVE-2026-6968 5.9 MEDIUM Multiple Path Traversal Variants in awslabs/tough
CVE-2026-6967 5.9 MEDIUM Missing Delegated Metadata Validation in awslabs/tough

IV. Related Vulnerabilities

Same product: tough
Same vendor: AWS
Same weakness: CWE-347

V. Comments for CVE-2026-6966

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