PYSEC-2026-2387 AWS Encryption SDK for Python: Key commitment policy bypass via shared key cache

Summary AWS Encryption SDK ESDK for Python is a client-side encryption library. An issue exists where, under certain circumstances, a specific cryptographic algorithm downgrade in the caching layer might allow an authenticated local threat actor to bypass key commitment policy enforcement via a...

EUVD-2026-23943

AWS Encryption SDK for Python: Key commitment policy bypass via shared key cache...

CVE-2026-6550 Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python

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...

CVE-2026-6550: Selection of Less-Secure Algorithm During Negotiation

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...