{"id":"CVE-2026-6966","revision":"a21391f24fd241fb8223a0e5741e43be","records":[{"revision":"a21391f24fd241fb8223a0e5741e43be","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-6966","aliases":[],"title":"Signature Threshold Bypass in awslabs/tough Delegated Roles","description":"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.\n\n\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.","state":0,"publishedAt":"2026-04-24T19:38:24.907+00:00","modifiedAt":"2026-10-20T18:24:24.155+00:00","affected":[{"ecosystem":"Vendor product","name":"tough","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"AWS\",\n                    \"product\": \"tough\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0.9.0\",\n                            \"lessThanOrEqual\": \"0.21\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"},{"ecosystem":"Vendor product","name":"tuftool","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"AWS\",\n                    \"product\": \"tuftool\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThanOrEqual\": \"0.14\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","score":5.3,"severity":"MEDIUM"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","score":7,"severity":"HIGH"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6966","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6966","identifiers":["CVE-2026-6966"]},"retained":false,"historicalAffected":[]}],"coverage":[]}