CVE-2024-5642

high

Published 2025-12-18 · Modified 2025-12-18

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CVSS v3

—

CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

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).

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

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OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`7.3.10+dfsg-1`
sid	Fixed	`7.3.10+dfsg-1`
forky	Fixed	`7.3.10+dfsg-1`
bullseye	Affected	—
bookworm	Fixed	`7.3.10+dfsg-1`

AlmaLinux Fixed 1 release

Version	Status	Fixed in
9	Fixed	`python3-tkinter-3.9.25-2.el9_7.aarch64.rpm`

Red Hat Fixed 2 releases

Version	Status	Fixed in
9	Fixed	—
8	Fixed	—

Rocky Linux Fixed 2 releases

Version	Status	Fixed in
9	Fixed	—
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.