Description
Out-of-bounds Read in lws_upng_emit_next_line in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to read 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 height dimension.
References (2)
Core 2
Core References
Various Sources patch
vendor-advisory
https://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101
Various Sources third-party-advisory
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679
Scores
CVSS v4
5.9
EPSS
0.0004
EPSS Percentile
13.8%
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (2)
warmcat/libwebsockets
4.0 - 4.3.6
warmcat/libwebsockets
4.0 - 4.4.2
Published
Oct 20, 2025
Tracked Since
Feb 18, 2026