{"answers":{"affected":"4 open source packages ship an affected version, including tough and tuftool. It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-6966 in the wild and no public exploit code.","fix":"Upgrade tough to 0.22.0 or later.","what":"CVE-2026-6966 is a high-severity vulnerability in AWS tough, published on 24 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-6966 and fix it if it is affected.\n\nWhat it is: CVE-2026-6966 is a high-severity vulnerability in AWS tough, published on 24 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-6966 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- tough (crates.io): affected all versions; fixed in 0.22.0\n- tough (crates.io): affected all versions; fixed in 0.22.0\n- tuftool (crates.io): affected all versions; fixed in 0.15.0\n- tuftool (crates.io): affected all versions; fixed in 0.15.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-6966/ (Markdown: https://insights.sbomify.com/CVE-2026-6966/index.md)","id":"CVE-2026-6966","markdown":"https://insights.sbomify.com/CVE-2026-6966/index.md","name":"CVE-2026-6966","record":{"aliases":["GHSA-8m7c-8m39-rv4x"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"TUF Rust library","requires_auth":"low_privilege","summary":"Attackers can bypass TUF signature thresholds by duplicating signatures, allowing acceptance of forged delegated role metadata in the tough library.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"AMZN","cpe":[{"product":"tough","vendor":"amazon"},{"product":"tuftool","vendor":"amazon"}],"cvss":{"score":7,"severity":"high","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"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\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.","ecosystems":["crates.io"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Signature Threshold Bypass in awslabs/tough Delegated Roles","id":"CVE-2026-6966","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":4,"n_references":6,"next":{"headline":"Missing Delegated Metadata Validation in awslabs/tough","id":"CVE-2026-6967"},"packages":[{"ecosystem":"crates.io","fixed":["0.22.0"],"introduced":["0"],"last_affected":[],"package":"tough","purl":null,"source":"GHSA-8m7c-8m39-rv4x"},{"ecosystem":"crates.io","fixed":["0.22.0"],"introduced":["0"],"last_affected":[],"package":"tough","purl":"pkg:cargo/tough","source":"GHSA-8m7c-8m39-rv4x"},{"ecosystem":"crates.io","fixed":["0.15.0"],"introduced":["0"],"last_affected":[],"package":"tuftool","purl":null,"source":"GHSA-8m7c-8m39-rv4x"},{"ecosystem":"crates.io","fixed":["0.15.0"],"introduced":["0"],"last_affected":[],"package":"tuftool","purl":"pkg:cargo/tuftool","source":"GHSA-8m7c-8m39-rv4x"}],"prev":{"headline":"Missing authorization in Tutor LMS – eLearning and online course solution","id":"CVE-2026-6965"},"products":["tough","tuftool"],"published":"2026-04-24","related":[{"cvss_score":8.6,"headline":"Improper verification of signature threshold in tough","id":"CVE-2020-15093","kev_date_added":null,"published":"2020-07-09"},{"cvss_score":8.2,"headline":"Improper sanitization of target names in tough","id":"CVE-2021-41149","kev_date_added":null,"published":"2021-10-19"},{"cvss_score":8.2,"headline":"Improper sanitization of delegated role names in tough","id":"CVE-2021-41150","kev_date_added":null,"published":"2021-10-19"},{"cvss_score":7.1,"headline":"Missing Delegated Metadata Validation in awslabs/tough","id":"CVE-2026-6967","kev_date_added":null,"published":"2026-04-24"},{"cvss_score":7.1,"headline":"Multiple Path Traversal Variants in awslabs/tough","id":"CVE-2026-6968","kev_date_added":null,"published":"2026-04-24"},{"cvss_score":5.7,"headline":"Root metadata version not validated in tough","id":"CVE-2025-2885","kev_date_added":null,"published":"2025-03-27"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-20","vendors":["AWS"]},"summary":"Attackers can bypass TUF signature thresholds by duplicating signatures, allowing acceptance of forged delegated role metadata in the tough library.","url":"https://insights.sbomify.com/CVE-2026-6966/"}