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CVE-2026-6966: amazon tough

CVSS: 7.0v4.0HighAnalyzed
AliasesCGA-g2w2-3h5f-ffm4GHSA-8m7c-8m39-rv4xCGA-r5jq-6pwf-v2qw
Published 24-04-2026Last modified 24-04-2026
Open JSON

Vulnerability summary

CVE-2026-6966 is a high (CVSS 7.0) vulnerability in amazon tough. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.3% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.0/10
010
High · v4.0 (CVE.org)
EPSS score
0.37%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-F4RW-4PGF-XFRG

Timeline

  1. 24-04-2026
    PublishedVulnerability first disclosed.
  2. 24-04-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

+0.11 pp

From 0.26% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Amazon2 products
Crates.Io2 products
  • tough< 0.22.0
  • tuftool< 0.15.0
Chainguard1 product
  • mise< 2026.5.8-r0

3 vendors · 5 products

References

10 links