Description

Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts. To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.

INFO

Published Date :

2026-04-20T19:20:23.383Z

Last Modified :

2026-04-20T19:44:11.685Z

Source :

AMZN
AFFECTED PRODUCTS

The following products are affected by CVE-2026-6550 vulnerability.

Vendors Products
Amazon
  • Aws Encryption Sdk For Python
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-6550.

URL Resource
https://aws.amazon.com/security/security-bulletins/2026-017-aws/ cve-icon cve-icon
https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1 cve-icon cve-icon
https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5 cve-icon cve-icon
https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv cve-icon cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
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Confidentiality Impact
Integrity Impact
Availability Impact