NULL pointer dereference in libmicrohttpd - CVE-2025-59777

Vulnerability identifier: #VU118833

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-59777

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error. A remote attacker can send a specially crafted HTTP request to the server and perform a denial of service (DoS) attack.

libmicrohttpd
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Micro
Basesystem Module
Desktop Applications Module
openSUSE Leap
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
Fedora
libmicrohttpd12-debuginfo
libmicrohttpd12
libmicrohttpd-devel
libmicrohttpd-debugsource
libmicrohttpd

Install update from vendor's repository.

libmicrohttpd12-debuginfo - addressed in versions 0.9.77-150600.3.3.1, 1.0.1-160000.3.1
libmicrohttpd12 - addressed in versions 0.9.77-150600.3.3.1, 1.0.1-160000.3.1
libmicrohttpd-devel - addressed in versions 0.9.77-150600.3.3.1, 1.0.1-160000.3.1
libmicrohttpd-debugsource - addressed in versions 0.9.77-150600.3.3.1, 1.0.1-160000.3.1
libmicrohttpd - addressed in versions 1.0.3-1.fc42, 1.0.3-1.fc43, 1.0.3-1.fc44

• https://git.gnunet.org/libmicrohttpd.git/commit/?id=ff13abc1c1d7d2b30d69d5c0bd4a237e1801c50b
• https://jvn.jp/en/jp/JVN76719218/

• Two DoS vulnerabilities in GNU libmicrohttpd
• SUSE update for libmicrohttpd
• SUSE update for libmicrohttpd
• SUSE update for libmicrohttpd
• Fedora 44 update for libmicrohttpd
• Fedora 43 update for libmicrohttpd
• Fedora 42 update for libmicrohttpd