Memory leak in libhtp - CVE-2025-53537

Vulnerability identifier: #VU113190

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-2025-53537

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due memory leak. A remote attacker can force the application to leak memory and perform denial of service attack.

libhtp
Fedora
Ubuntu
libhtp (Ubuntu package)
suricata

Install updates from vendor's website.

libhtp - update to 0.5.51
libhtp (Ubuntu package) - addressed in versions 0.5.15-1ubuntu0.1~esm1, 1:0.5.26-1ubuntu0.1~esm1, 1:0.5.32-1ubuntu0.1~esm1, 1:0.5.39-1ubuntu0.1~esm1, 1:0.5.46-1ubuntu2+esm1, 1:0.5.49-1ubuntu0.1
suricata - addressed in versions 7.0.11-1.el8, 7.0.11-1.el9, 7.0.11-1.fc41, 7.0.11-1.fc42

• https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7
• https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7

• Denial of service in libhtp
• Fedora EPEL 9 update for suricata
• Fedora EPEL 9 update for suricata
• Fedora EPEL 8 update for suricata
• Fedora EPEL 8 update for suricata
• Fedora 41 update for suricata
• Fedora 41 update for suricata
• Fedora 42 update for suricata
• Fedora 42 update for suricata
• Ubuntu update for libhtp