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 …
Published: 2026-04-20 · CVSS: 5.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7