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Advisory record · GHSA-8m7c-8m39-rv4x

awslabs/tough Delegated Roles have a Signature Threshold Bypass

CVSS 7.0 HighEPSS 0.0028 · 21st percentile

Published by the GitHub Advisory Database at 5 May 2026, 18:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
toughcrates.io<0.22.00.22.0
tuftoolcrates.io<0.15.00.15.0
Identifiers
GHSA-8m7c-8m39-rv4x · CVE-2026-6966
Weakness (CWE)
CWE-347
Tags
Published
5 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The tough crate before 0.22.0 and the tuftool crate before 0.15.0 do not check that signatures used to meet a delegated role's threshold come from unique keys. An attacker who already holds a valid signing key can duplicate one signature to reach the threshold, so clients may accept forged delegated role metadata. Upgrade tough to 0.22.0 and tuftool to 0.15.0; no workarounds are known.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.0 High 4.0 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 CNA (AMZN)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 21st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:17 UTC First seen by agentprime
  2. 31 Oct 2026, 15:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.