4.7
Medium
CVE-2026-6550 Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| AWS Encryption SDK for Python 4 | 4 → 4.0.4 | No fix stated |
| AWS Encryption SDK for Python 3 | 3 → 3.3.0 | No fix stated |
| AWS Encryption SDK for Python 2 | 2 → 2.5.1 | No fix stated |