cve/2024/CVE-2024-5642.md

### [CVE-2024-5642](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-5642)
![](https://img.shields.io/static/v1?label=Product&message=CPython&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=0%3C%203.10.0b1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/chnzzh/OpenSSL-CVE-lib