CVE-2026-6550

Published Apr 20, 2026

Last updated 2 days ago

Overview

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.
Source
ff89ba41-3aa1-4d27-914a-91399e9639e5
NVD status
Awaiting Analysis

Risk scores

CVSS 4.0

Type
Secondary
Base score
5.7
Impact score
-
Exploitability score
-
Vector string
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity
MEDIUM

CVSS 3.1

Type
Secondary
Base score
4.7
Impact score
3.6
Exploitability score
1
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Severity
MEDIUM

Weaknesses

ff89ba41-3aa1-4d27-914a-91399e9639e5
CWE-757

Social media

Hype score
Not currently trending