VULNERABILITY INTELLIGENCE
CVE-2026-6550
CVSS score5.7 MEDIUM
EPSS probability0.10%
CISA KEVNot currently listed
Published2026-04-20
Last modified2026-10-26
CVSS vectorCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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.
Weakness classification
- CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')