CVE-2025-11680
Published: October 23, 2025Last modified: June 18, 2026
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.
Notes
lws_upng decoder was only introduced in 4.4
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | libwebsockets | Not affected (4.3.2-r1) |
| 25 LTS | libwebsockets | Not affected (4.3.5-r2) | |
| Stream | libwebsockets | Not affected (4.3.1-r0) |