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CVE-2026-6550

4.7 · MEDIUM

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 bypa…

Published Apr 20, 2026CWE-757EPSS 0.10%

Overview

CVE-2026-6550 is a medium-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaws.amazon.com/security/security-bulletins/2026-017-aws/GitHubgithub.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1GitHubgithub.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5GitHubgithub.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv

How CyberStrike helps

Frequently asked questions

What is CVE-2026-6550?

CVE-2026-6550 is a medium-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-6550?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-6550?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-6550?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-6550 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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