CVE-2024-5642: Python Software Foundation CPython

Buffer overread when using an empty list with SSLContext.set_npn_protocols()

CVSS 6.5 MediumEPSS 0.0074 · 54th percentile

Published by the CVE Program (CNA: PSF) at 27 Jun 2024, 21:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Python Software Foundation	CPython	affected before 3.9.24 python affected 3.10.0a1 to before 3.10.0b1 python Other versions: unaffected

Identifiers

CVE-2024-5642

CNA

PSF

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.5	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L	ADP (CISA-ADP)

CISA KEV Not listed.
EPSS 0.0074, the 54th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 27 Jun 2024. New records show when each source confirmed them.

Sources

References from the CNA

jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html third-party-advisory
github.com/python/cpython/pull/23014 mitigation
mail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/ vendor-advisory
github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e patch
www.openwall.com/lists/oss-security/2024/06/28/4
github.com/python/cpython/issues/121227 issue-tracking
security.netapp.com/advisory/ntap-20240726-0005/
github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.