CVE-2026-6966Signature Threshold Bypass in awslabs/tough Delegated Roles
Updated under an hour ago ()
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It affects AWS tough and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-347
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- AMZN
- NVD analysis
- Modified
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
AWS tough aws:tough (from the name) | from 0.9.0 through 0.21 | CNA record |
AWS tuftool aws:tuftool (from the name) | through 0.14 | CNA record |
amazon tough amazon:tough | before 0.22.0 | NVD |
amazon tuftool amazon:tuftool | before 0.15.0 | NVD |
References
- https://aws.amazon.com/security/security-bulletins/2026-019-aws/vendor-advisory
- https://github.com/awslabs/tough/releases/tag/tough-v0.22.0patch, release-notes
- https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0patch, release-notes
- https://crates.io/crates/tough/0.22.0patch, product
- https://crates.io/crates/tuftool/0.15.0patch, product
- https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4xthird-party-advisory, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.