CVE-2026-6550— Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Quick assessment
Affected
AWS AWS Encryption SDK for Python
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Amazon AWS Encryption SDK是美国亚马逊（Amazon）公司的一个应用于加密的开发工具包。 Amazon AWS Encryption SDK 3.3.1之前版本和4.0.5之前版本存在安全漏洞，该漏洞源于加密算法降级问题，可能导致经过身份验证的本地威胁参与者绕过密钥承诺策略执行。
Possible ATT&CK Techniques 1 AI
T1408
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I. Basic Information for CVE-2026-6550
Vulnerability Information
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Vulnerability Title
Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在会话协商时选择低安全性的算法(算法降级)
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon AWS Encryption SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon AWS Encryption SDK是美国亚马逊（Amazon）公司的一个应用于加密的开发工具包。 Amazon AWS Encryption SDK 3.3.1之前版本和4.0.5之前版本存在安全漏洞，该漏洞源于加密算法降级问题，可能导致经过身份验证的本地威胁参与者绕过密钥承诺策略执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| AWS | AWS Encryption SDK for Python | 2 ~ 2.5.1 | - |
|
II. Public POCs for CVE-2026-6550
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2026-6550
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