{"id":"CVE-2026-6966","sourceIdentifier":"ff89ba41-3aa1-4d27-914a-91399e9639e5","published":"2026-04-24T20:16:28.883","lastModified":"2026-10-26T21:10:00.170","vulnStatus":"Modified","cveTags":[],"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\n\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0."},{"lang":"es","value":"Verificación incorrecta de la unicidad de la firma criptográfica en la validación de roles delegados en awslabs/tough en versiones anteriores a la tough-v0.22.0 permite a usuarios remotos autenticados eludir el requisito del umbral de firma de TUF duplicando una firma válida, lo que provoca que el cliente acepte metadatos de roles delegados falsificados.\n\nSe recomienda actualizar a tough-v0.22.0 / tuftool-v0.15.0."}],"affected":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","affectedData":[{"vendor":"AWS","product":"tough","defaultStatus":"unaffected","versions":[{"version":"0.9.0","lessThanOrEqual":"0.21","versionType":"custom","status":"affected"}]},{"vendor":"AWS","product":"tuftool","defaultStatus":"unaffected","versions":[{"version":"0","lessThanOrEqual":"0.14","versionType":"custom","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","cvssData":{"version":"4.0","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/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:X/V:X/RE:X/U:X","baseScore":7.0,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.6,"impactScore":3.6},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-24T20:15:12.033311Z","id":"CVE-2026-6966","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","type":"Secondary","description":[{"lang":"en","value":"CWE-347"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*","versionEndExcluding":"0.22.0","matchCriteriaId":"B861C5C6-71EB-48B0-B55E-71BBF56DF2BF"},{"vulnerable":true,"criteria":"cpe:2.3:a:amazon:tuftool:*:*:*:*:*:rust:*:*","versionEndExcluding":"0.15.0","matchCriteriaId":"E83215AA-4B4B-44C1-A062-B7212CF33EF5"}]}]}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-019-aws/","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Vendor Advisory"]},{"url":"https://crates.io/crates/tough/0.22.0","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Product"]},{"url":"https://crates.io/crates/tuftool/0.15.0","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Product"]},{"url":"https://github.com/awslabs/tough/releases/tag/tough-v0.22.0","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Release Notes"]},{"url":"https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Release Notes"]},{"url":"https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x","source":"ff89ba41-3aa1-4d27-914a-91399e9639e5","tags":["Vendor Advisory"]}]}