PT-2026-33829 · Aws · Aws Encryption Sdk For Python

1Seal.Org · Published 2026-04-20 · Updated 2026-04-20 · CVE-2026-6550

Mitre

CVSS v3.1

4.7

Medium

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

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.

Fix

Weakness Enumeration

CWE-757

Related Identifiers

CVE-2026-6550

Affected Products

Aws Encryption Sdk For Python

References · 5

• 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://nvd.nist.gov/vuln/detail/CVE-2026-6550 · Security Note
• https://aws.amazon.com/security/security-bulletins/2026-017-aws · Vendor Advisory
• https://github.com/aws/aws-encryption-sdk-python/security/advisories/GHSA-v638-38fc-rhfv · Note