CVE-2026-6966: CWE-347: Improper Verification of Cryptographic Signature in AWS tough
CVE-2026-6966 is a medium severity vulnerability in AWS tough prior to version 0. 22. 0. It involves improper verification of cryptographic signature uniqueness during delegated role validation, allowing remote authenticated users to bypass the TUF signature threshold by duplicating a valid signature. This flaw can cause the client to accept forged delegated role metadata, potentially impacting the integrity of the update process. AWS recommends upgrading to tough version 0. 22. 0 or tuftool version 0. 15 to address this issue.
AI Analysis
Technical Summary
The vulnerability CVE-2026-6966 affects AWS tough before version 0.22.0 and is categorized under CWE-347 (Improper Verification of Cryptographic Signature). It allows remote authenticated users to bypass the TUF (The Update Framework) signature threshold by duplicating a valid signature during delegated role validation. This improper verification can lead to acceptance of forged delegated role metadata, undermining the integrity of the update process. AWS has released fixes in tough version 0.22.0 and tuftool version 0.15 to remediate this issue.
Potential Impact
The vulnerability impacts the integrity of the update process by allowing attackers who have remote authenticated access to bypass signature verification thresholds. This can result in the acceptance of forged delegated role metadata, potentially enabling unauthorized updates or code execution through compromised update metadata. There is no impact on confidentiality or availability reported. No known exploits in the wild have been identified.
Mitigation Recommendations
A patch is available. AWS recommends upgrading to tough version 0.22.0 or tuftool version 0.15 to remediate this vulnerability. Since this is a cloud service component, AWS manages remediation for the cloud-hosted service. Users should apply the recommended upgrades to ensure protection against this issue. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-019-aws/ for the latest guidance.
CVE-2026-6966: CWE-347: Improper Verification of Cryptographic Signature in AWS tough
Description
CVE-2026-6966 is a medium severity vulnerability in AWS tough prior to version 0. 22. 0. It involves improper verification of cryptographic signature uniqueness during delegated role validation, allowing remote authenticated users to bypass the TUF signature threshold by duplicating a valid signature. This flaw can cause the client to accept forged delegated role metadata, potentially impacting the integrity of the update process. AWS recommends upgrading to tough version 0. 22. 0 or tuftool version 0. 15 to address this issue.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-6966 affects AWS tough before version 0.22.0 and is categorized under CWE-347 (Improper Verification of Cryptographic Signature). It allows remote authenticated users to bypass the TUF (The Update Framework) signature threshold by duplicating a valid signature during delegated role validation. This improper verification can lead to acceptance of forged delegated role metadata, undermining the integrity of the update process. AWS has released fixes in tough version 0.22.0 and tuftool version 0.15 to remediate this issue.
Potential Impact
The vulnerability impacts the integrity of the update process by allowing attackers who have remote authenticated access to bypass signature verification thresholds. This can result in the acceptance of forged delegated role metadata, potentially enabling unauthorized updates or code execution through compromised update metadata. There is no impact on confidentiality or availability reported. No known exploits in the wild have been identified.
Mitigation Recommendations
A patch is available. AWS recommends upgrading to tough version 0.22.0 or tuftool version 0.15 to remediate this vulnerability. Since this is a cloud service component, AWS manages remediation for the cloud-hosted service. Users should apply the recommended upgrades to ensure protection against this issue. Check the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-019-aws/ for the latest guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-04-24T16:15:44.932Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-019-aws/","vendor":"AWS"}]
Threat ID: 69ebcd2c87115cfb686cfc0e
Added to database: 4/24/2026, 8:06:04 PM
Last enriched: 6/5/2026, 7:30:31 PM
Last updated: 6/7/2026, 9:50:14 PM
Views: 70
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