{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6966","assignerOrgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","state":"PUBLISHED","assignerShortName":"AMZN","dateReserved":"2026-04-24T16:15:44.932Z","datePublished":"2026-04-24T19:38:24.907Z","dateUpdated":"2026-04-24T20:15:28.842Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","shortName":"AMZN","dateUpdated":"2026-04-24T19:59:12.012Z"},"title":"Signature Threshold Bypass in awslabs/tough Delegated Roles","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-475","descriptions":[{"lang":"en","value":"CAPEC-475: Signature Spoofing by Misrepresentation"}]}],"affected":[{"vendor":"AWS","product":"tough","versions":[{"status":"unaffected","version":"0.22.0"}],"defaultStatus":"unaffected"},{"vendor":"AWS","product":"tuftool","versions":[{"status":"unaffected","version":"0.15.0"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>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.</p><p>We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.</p>"}]}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-019-aws/","tags":["vendor-advisory"]},{"url":"https://github.com/awslabs/tough/releases/tag/tough-v0.22.0","tags":["patch"]},{"url":"https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0","tags":["patch"]},{"url":"https://crates.io/crates/tough/0.22.0","tags":["patch"]},{"url":"https://crates.io/crates/tuftool/0.15.0","tags":["patch"]},{"url":"https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7,"vectorString":"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"}}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-24T20:15:12.033311Z","id":"CVE-2026-6966","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-24T20:15:28.842Z"}}]}}