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    CVE-2026-6966

    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.

    Published:Apr 24, 2026
    Last Modified:May 6, 2026
    EPS:Apr 24, 2026
    EPSS Score:0.00017
    CVSS Score:5.3

    Affected Products

    Vendor
    Amazon
    Product
    Tough
    Vendor
    Amazon
    Product
    Tuftool
    Vendor
    Aws
    Product
    Tough
    Vendor
    Aws
    Product
    Tuftool

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-6968 (CVSS 7.1) — Incomplete path traversal fixes in awslabs/tough before tough-v0.22.0 allow remote authenticated users with de…
    CVE-2026-6967 (CVSS 7.1) — Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before toug…
    CVE-2025-2888 (CVSS 5.7) — During a snapshot rollback, the client incorrectly caches the timestamp metadata. If the client checks the cac…
    CVE-2025-2887 (CVSS 5.7) — During a target rollback, the client fails to detect the rollback for delegated targets. This could cause the …
    CVE-2025-2886 (CVSS 5.7) — Missing validation of terminating delegation causes the client to continue searching the defined delegation li…
    CVE-2025-2885 (CVSS 5.7) — Missing validation of the root metatdata version number could allow an actor to supply an arbitrary version nu…
    CVE-2021-41150 (CVSS 8.2) — Tough provides a set of Rust libraries and tools for using and generating the update framework (TUF) repositor…
    CVE-2021-41149 (CVSS 8.2) — Tough provides a set of Rust libraries and tools for using and generating the update framework (TUF) repositor…
    CVE-2020-15093 (CVSS 8.6) — The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptograp…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High