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01 Record

CVE-2026-6966

Signature Threshold Bypass in awslabs/tough Delegated Roles

HighPUBLISHEDCNA: AMZN
CNA base score7.0 CVSS v4.0CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
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02 Description

Signature Threshold Bypass in awslabs/tough Delegated Roles

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.28% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 20.5% of scored records. A rank, not a probability.
NVD base score
7.0 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Modified. NVD last modified this record on 2026-10-26.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-04-24 19:38Z6 MO AGO
Last updated
2026-10-20 18:24Z8 DAYS AGO
Reserved
2026-04-24
Assigning CNA
AMZN
Record state
PUBLISHED
Severity
High (CVSS 7.0)
CNA CVSS vector
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
Weaknesses
  • CWE-347Improper Verification of Cryptographic SignatureBase
Data version
5.2
Document digest
a24d4b2c5f7c63cacf91ececac49e0f9cc06b292b6efbd1f90a360c52bf7c3f6

05 Affected products

VendorProductVersionsPlatforms
AWStough0.9.0 to 0.21—
AWStuftool0 to 0.14—

06 References