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CVE

CWE

Training

CVE-2025-11680

Published: Oct 20, 2025

Modified: Oct 20, 2025

PUBLISHED

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.

Vendor	Product	Versions
warmcat	libwebsockets	affected `4.0 - <= 4.4.2` affected `4.0 - <= 4.3.6`

Weaknesses (CWE)

References

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

patch

vendor-advisory

https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11680

third-party-advisory

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