CVE-2024-5642— Buffer overread when using an empty list with SSLContext.set_npn_protocols()
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I. Basic Information for CVE-2024-5642
Vulnerability Information
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Vulnerability Title
Buffer overread when using an empty list with SSLContext.set_npn_protocols()
Source: NVD (National Vulnerability Database)
Vulnerability 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).
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python 3.9 及之前版本存在安全漏洞，该漏洞源于使用 NPN 时会导致缓冲区过度读取。
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 |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.10.0b1 | - |
II. Public POCs for CVE-2024-5642
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.htmlthird-party-advisory
- https://github.com/python/cpython/issues/121227issue-tracking
- https://nvd.nist.gov/vuln/detail/CVE-2024-5642
IV. Related Vulnerabilities
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Out-of-bounds read/write during remote profiling and asyncio - CVE-2026-4786
Incomplete mitigation of CVE-2026-4519, %action expansion fo
Same vendor: Python Software Foundation
- CVE-2026-3087
shutil.unpack_archive() doesn't check for Windows absolute p - CVE-2026-6019
BaseCookie.js_output() does not neutralize embedded characte - CVE-2026-3298
Out-of-bounds write in Windows asyncio.ProacterEventLoop.soc - CVE-2026-5713
Out-of-bounds read/write during remote profiling and asyncio - CVE-2026-4786
Incomplete mitigation of CVE-2026-4519, %action expansion fo
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