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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| warmcat | libwebsockets | 4.0 – ≤ 4.4.2, 4.0 – ≤ 4.3.6 | — |
References
- https://libwebsockets.org/git/libwebsockets/commit?id=7df24cca7144d7bc9233b6b0a71108bd154ce101 patch vendor-advisory
- https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11679 third-party-advisory