CVE-2026-6550 — Cryptographic algorithm downgrade in the caching layer of
CVE-2026-6550 — 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 th
What This Means For You
- If your environment is affected by CWE-757, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-6550 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-6550 - AWS Encryption SDK Python Cache Downgrade Attempt
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-6550 | vulnerability | CVE-2026-6550 |
| CWE-757 | weakness | CWE-757 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 20, 2026 at 23:16 UTC |
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