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Vulnerability DatabaseCVE-2025-62689

CVE-2025-62689: 
NixOS vulnerability analysis and mitigation

Overview

A NULL pointer dereference vulnerability (CVE-2025-62689) was discovered in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was identified in November 2025 and affects the experimental WebSocket implementation (libmicrohttpd_ws.so) when built with the --enable-experimental option (JPCERT Advisory).

Technical details

The vulnerability exists specifically in libmicrohttpd_ws.so, which is generated when building with the --enable-experimental option, rather than in the widely used libmicrohttpd.so. The issue was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. The vulnerability has received a CVSS v3.0 Base Score of 7.5 (High) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (NVD).

Impact

A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition in the affected system (JPCERT Advisory).

Mitigation and workarounds

Users are recommended to stop using libmicrohttpd_ws.so as it is an experimental implementation. The vulnerability has been fixed in the master branch of the libmicrohttpd Git repository with commit ff13abc (JPCERT Advisory).

Additional resources

Source: This report was generated using AI

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