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CVE-2026-6967— Missing Delegated Metadata Validation in awslabs/tough

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，该漏洞源于委托元数据验证中缺少过期、哈希和长度强制检查，可能导致具有委托签名权限的远程经过身份验证的用户绕过TUF规范完整性检查并污染本地元数据缓存。

CVSS 5.9 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-6967

Vulnerability Information
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Vulnerability Title
Missing Delegated Metadata Validation in awslabs/tough
Source: CVE Program / CVE List V5
Vulnerability Description
Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users with delegated signing authority to bypass TUF specification integrity checks for delegated targets metadata and poison the local metadata cache, because load_delegations does not apply the same validation checks as the top-level targets metadata path. 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:L
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
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，该漏洞源于委托元数据验证中缺少过期、哈希和长度强制检查，可能导致具有委托签名权限的远程经过身份验证的用户绕过TUF规范完整性检查并污染本地元数据缓存。
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-2026-6967

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III. Intelligence Information for CVE-2026-6967

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Vendor Advisories for CVE-2026-6967 (2)

Vendor Pages for CVE-2026-6967 (3)

Other References for CVE-2026-6967 (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-2026-6966 5.3 MEDIUM Signature Threshold Bypass in awslabs/tough Delegated Roles

IV. Related Vulnerabilities

Same product: tough
Same vendor: AWS
Same weakness: CWE-345

V. Comments for CVE-2026-6967

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