Summaryinfo

A vulnerability, which was classified as critical, has been found in warmcat libwebsockets up to 4.3.3. Affected is an unknown function. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2025-1866. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Detailsinfo

A vulnerability was found in warmcat libwebsockets up to 4.3.3. It has been rated as critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows Pointer Manipulation, potentially leading to out-of-bounds memory access. This issue affects libwebsockets before 4.3.4 and is present in code built specifically for the Win32 platform. By default, the affected code is not executed unless one of the following conditions is met: LWS_WITHOUT_EXTENSIONS (default ON) is manually set to OFF in CMake. LWS_WITH_HTTP_STREAM_COMPRESSION (default OFF) is manually set to ON in CMake. Despite these conditions, when triggered in affected configurations, this vulnerability may allow attackers to manipulate pointers, potentially leading to memory corruption or unexpected behavior.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-1866 since 03/03/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 4.3.4 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• warmcat

Name

• libwebsockets

Version

• 4.3.0
• 4.3.1
• 4.3.2
• 4.3.3

Website

• Product: https://github.com/warmcat/libwebsockets/

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