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Security Database

CVE

CWE

Training

CVE-2026-6550

Published: Apr 20, 2026

Modified: Apr 20, 2026

PUBLISHED

CVSS v3.1

4.7

MEDIUM

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.

Vendor	Product	Versions
AWS	AWS Encryption SDK for Python	affected `2 - <= 2.5.1` affected `3 - <= 3.3.0` affected `4 - <= 4.0.4`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

https://aws.amazon.com/security/security-bulletins/2026-017-aws/

vendor-advisory

https://github.com/aws/aws-encryption-sdk-python/releases/tag/v4.0.5

patch

https://github.com/aws/aws-encryption-sdk-python/releases/tag/v3.3.1

patch

https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv

third-party-advisory

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