High · CVSS 7.0CVE-2026-6966

Signature Threshold Bypass in awslabs/tough Delegated RolesCVE-2026-6966

Answer in brief

CVE-2026-6966 records a High severity (CVSS 7.0) vulnerability in Signature Threshold Bypass in awslabs/tough Delegated Roles. The current sources do not mark it as known exploited. The current feed maps AWS/tough (generic), AWS/tuftool (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 24, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.0
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/tough (generic), AWS/tuftool (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
AWS/toughgeneric	>=0.9.0 <=0.21	Not reported
AWS/tuftoolgeneric	>=0 <=0.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for AWS/tough, AWS/tuftool.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 20, 2026

Sources and claim methodology

Upstream source 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. We recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.

Quoted source text, attributed separately from HOL analysis.