cve/2024/CVE-2024-5642.md

CVE-2024-5642

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