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Signature Threshold Bypass in awslabs/tough Delegated Roles

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-6966

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-6966

tough

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

tuftool

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "AWS",
    "product": "tough",
    "versions": [
      {
        "status": "affected",
        "version": "0.9.0",
        "versionType": "custom",
        "lessThanOrEqual": "0.21"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "AWS",
    "product": "tuftool",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "versionType": "custom",
        "lessThanOrEqual": "0.14"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-6966

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#42478 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement