# CVE-2026-6550

> Vulnerability · severity: **MEDIUM** (CVSS 4.7).

## 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.

## Key facts

- **CVE ID:** CVE-2026-6550
- **Published:** 2026-04-20
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.7
- **CWE codes:** CWE-757

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6550

## Citation

> AI Analytics. CVE-2026-6550. Retrieved 2026-07-10 from https://api.ai-analytics.org/cve/CVE-2026-6550. Derived from NIST NVD. Licensed CC0.

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