CVE-2025-11680

Medium

Description

Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.

SeverityMedium

CVSS5.9

Exploit probability—

ProductWarmcat Libwebsockets

PublishedOct 20, 2025

First seenOct 20, 2025

Weakness typeCWE-787Out-of-bounds write

How to fix

Patches

libwebsockets.org/git/libwebsockets/commit?id=2b715249f39291c86443b969a1088d59b6a89b78

Affected products

Product	Affected versions	Fixed in
warmcat libwebsockets	4.0 ≤ v ≤ 4.4.2, 4.0 ≤ v ≤ 4.3.6	—

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.