CVE-2025-11680 - CVE House
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Status published Medium CVE-2025-11680

Out-of-bounds Write in libwebsockets PNG parsing

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Raffaele Bova at Nozomi Networks

References

More from warmcat

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CVE-2025-1866
Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic in libwebsockets
Critical 10
CVE-2025-11679
Out-of-bounds Read in libwebsockets PNG parsing
Medium 5.9
CVE-2025-11678
Stack-based Buffer Overflow in libwebsockets DNS response parsing
High 7.5
CVE-2025-11677
Use After Free in libwebsockets WebSocket server
Medium 6.3

Affected Vendor

Affected Software

libwebsockets
Vulnerable Versions:
4.0

Timeline

Official Publish: October 20th, 2025
Last Modified: October 20th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-787

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control
T1485 Data Destruction
Impact