CVE-2026-6967 Details
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.
A vulnerability exists in the AWS Tough library and the Tuftool command-line interface, specifically in versions of Tough prior to 0.22.0 and Tuftool prior to 0.15.0. The issue arises from inadequate expiration, hash, and length enforcement during delegated metadata validation. This flaw allows remote authenticated users with delegated signing authority to circumvent integrity checks specified by The Update Framework (TUF) for delegated targets metadata. As a result, these users can poison the local metadata cache. The vulnerability occurs because the 'load_delegations' function fails to apply the same validation checks as the top-level targets metadata path.
Users are advised to upgrade to Tough version 0.22.0 or later and Tuftool version 0.15.0 or later. Instructions for upgrading are available in the Tough and Tuftool GitHub repositories.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 24, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://aws.amazon.com/security/security-bulletins/2026-019-aws/ | AMZN | Vendor Advisory |
| https://crates.io/crates/tough/0.22.0 | AMZN | Product |
| https://crates.io/crates/tuftool/0.15.0 | AMZN | Product |
| https://github.com/awslabs/tough/releases/tag/tough-v0.22.0 | AMZN | Release Notes |
| https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0 | AMZN | Release Notes |
| https://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3 | AMZN | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-345 | Insufficient Verification of Data Authenticity | AMZN |
Affected Products
| Product | Versions |
|---|---|
| amazon tough | >= 0.9.0, < 0.22.0 |
CPE
Remediation
| |
| amazon tuftool | < 0.15.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | AMZN |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 6, 2026 | Initial Analysis | [email protected] |
| Apr 24, 2026 | CVE Modified | AMZN |
| Apr 24, 2026 | New CVE Received | AMZN |