CVE-2026-6966— Signature Threshold Bypass in awslabs/tough Delegated Roles
Possible ATT&CK Techniques 1AI
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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
II. Public POCs 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
- CVE-2026-6968
Multiple Path Traversal Variants in awslabs/tough - CVE-2026-6967
Missing Delegated Metadata Validation in awslabs/tough - CVE-2025-2888
Improper timestamp caching during snapshot rollback in tough - CVE-2025-2887
Failure to detect delegated target rollback in tough - CVE-2025-2886
Terminating targets role delegations are not respected in to
Same vendor: AWS
- CVE-2026-18428
SQL Query Validation Bypass in OpenSearch Direct Query - CVE-2026-19643
Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-c - CVE-2026-19642
Out-of-bounds write in the Base64 decoder in Amazon aws-sdk- - CVE-2026-18952
Missing Input Validation in Threat Intel Feed Parser in Open - CVE-2026-19311
Missing Authorization in Execute Monitor API in OpenSearch A
Same weakness: CWE-347
- CVE-2026-18500
@fastify/jwt vulnerable to authorization bypass via global s - CVE-2026-74244
Quay: stripe webhook accepts forged events without signature - CVE-2026-19910
PAX Technology Q80 Application Installer Signature Verificat - CVE-2026-47192
kas's late signature validation may allow unnoticed reposito - CVE-2026-47191
kas checks out SHA-like git branches as valid commits
V. Comments for CVE-2026-6966
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