Vulnerability record · CVE-2026-6967 · published 24 April 2026

CVE-2026-6967: Amazon tough insufficient verification of data authenticity vulnerability

Amazon · Tough

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.

7.1 CVSS 4.0 High EPSS 0.30% · top 79.4% CWE-345 · Insufficient verification of data authenticity

7.1CVSS 4.0 base score

0.30%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Tough Amazon

Tuftool Amazon

References

Link	Tags
https://aws.amazon.com/security/security-bulletins/2026-019-aws/	Vendor Advisory
https://crates.io/crates/tough/0.22.0	Product
https://crates.io/crates/tuftool/0.15.0	Product
https://github.com/awslabs/tough/releases/tag/tough-v0.22.0	Release Notes
https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0	Release Notes
https://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-6967), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.