CVE-2026-6966
5.3
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | tough | 0.22.0 | unaffected |
| AWS | tuftool | 0.15.0 | unaffected |
Weaknesses
- CWE-347: CWE-347: Improper Verification of Cryptographic Signature
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://aws.amazon.com/security/security-bulletins/2026-019-aws/
- https://github.com/awslabs/tough/releases/tag/tough-v0.22.0
- https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0
- https://crates.io/crates/tough/0.22.0
- https://crates.io/crates/tuftool/0.15.0
- https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x
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