CVE-2025-11680
Out-of-bounds Write in libwebsockets PNG parsing
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.
INFO
Published Date :
Oct. 20, 2025, 2:15 p.m.
Last Modified :
Oct. 8, 2026, 10:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | bec8025f-a851-46e5-b3a3-058e6b0aa23c | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update libwebsockets to a patched version.
- Recompile with the LWS_WITH_UPNG flag disabled.
- Avoid displaying user-provided PNGs.
- Scan for malicious PNGs.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-11680.
| URL | Resource |
|---|---|
| https://libwebsockets.org/git/libwebsockets/commit?id=2b715249f39291c86443b969a1088d59b6a89b78 | |
| https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11680 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-11680 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-11680
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-11680 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-11680 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Changed Translation Title: libwebsockets de warmcat, Description: Escritura fuera de límites en unfilter_scanline en warmcat libwebsockets permite, cuando la bandera LWS_WITH_UPNG está habilitada durante la compilación y se utiliza la pila de visualización HTML, escribir más allá de un búfer asignado en el montón, posiblemente causando un fallo, cuando el usuario visita un sitio web controlado por un atacante que contiene un archivo PNG manipulado con un valor de ancho grande que causa un desbordamiento de entero cuyo valor se utiliza para determinar el tamaño de una asignación en el montón. Title: libwebsockets de warmcat, Description: Escritura fuera de límites en unfilter_scanline en warmcat libwebsockets permite, cuando la bandera LWS_WITH_UPNG está habilitada durante la compilación y se utiliza la pila de visualización HTML, escribir más allá de un búfer asignado en el montón, posiblemente causando un fallo, cuando el usuario visita un sitio web controlado por un atacante que contiene un archivo PNG manipulado con un valor de ancho grande que causa un desbordamiento de entero cuyo valor se utiliza para determinar el tamaño de una asignación en el montón. -
CVE Translated by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added Translation Title: libwebsockets de warmcat, Description: Escritura fuera de límites en unfilter_scanline en warmcat libwebsockets permite, cuando la bandera LWS_WITH_UPNG está habilitada durante la compilación y se utiliza la pila de visualización HTML, escribir más allá de un búfer asignado en el montón, posiblemente causando un fallo, cuando el usuario visita un sitio web controlado por un atacante que contiene un archivo PNG manipulado con un valor de ancho grande que causa un desbordamiento de entero cuyo valor se utiliza para determinar el tamaño de una asignación en el montón. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'warmcat', 'modules': ['unfilter_scanline'], 'product': 'libwebsockets', 'versions': [{'status': 'affected', 'version': '4.0', 'versionType': 'semver', 'lessThanOrEqual': '4.4.2'}, {'status': 'affected', 'version': '4.0', 'versionType': 'semver', 'lessThanOrEqual': '4.3.6'}], 'collectionURL': 'https://libwebsockets.org/git/libwebsockets', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-11680', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-10-20T14:34:46.949292Z'} -
New CVE Received by [email protected]
Oct. 20, 2025
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-787 Added Reference https://libwebsockets.org/git/libwebsockets/commit?id=2b715249f39291c86443b969a1088d59b6a89b78 Added Reference https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11680