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TI-2020-11868 Aliases CVE-2020-15093GHSA-5q2r-92f9-4m49

Improper verification of signature threshold in tough

Priority MEDIUM 40CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-347.

Summary

The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A fix is available in version 0.7.1. CVE-2020-6174 is assigned to the same vulnerability in the TUF reference implementation.

Why it matters now

EPSS 0.01357 71st percentileScored 2026-11-07
Fix Fixed tough (awslabs): 0.7.1tough (crates.io): 0.7.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWStoughbefore 0.7.10.7.1Patch availableCNA
—tough (crates.io)before 0.7.10.7.1Patch availableGHSA-5q2r-92f9-4m49
  • tough VendorAWS Affected before 0.7.1 Fixed in 0.7.1 Patch available CNA
  • tough (crates.io) Vendor— Affected before 0.7.1 Fixed in 0.7.1 Patch available GHSA-5q2r-92f9-4m49

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:*before 0.7.1VulnerableAWS
  • cpe:2.3:a:amazon:tough:*:*:*:*:*:rust:*:* Versions before 0.7.1 Vulnerable ·AWS

Remediation

  • Fix · CNA tough (awslabs) Fixed in 0.7.1
  • Fix · GHSA-5q2r-92f9-4m49 tough (crates.io) Fixed in 0.7.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-15093
  2. 2026-10-03 Alias added: GHSA-5q2r-92f9-4m49

References

Patch 2

Advisory 3

Other 2

  • TI-2021-17989 Improper sanitization of delegated role names in tough CVSS 3.1HIGH 8.2
  • TI-2021-17988 Improper sanitization of target names in tough CVSS 3.1HIGH 8.2
  • TI-2026-06100 Multiple Path Traversal Variants in awslabs/tough CVSS 4.0HIGH 7.1
  • TI-2026-06099 Missing Delegated Metadata Validation in awslabs/tough CVSS 4.0HIGH 7.1
  • TI-2026-06098 Signature Threshold Bypass in awslabs/tough Delegated Roles CVSS 4.0HIGH 7.0
  • TI-2025-02523 Improper timestamp caching during snapshot rollback in tough CVSS 4.0MEDIUM 5.7
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences