CVE-2025-53537 — Missing Release of Memory after Effective Lifetime in Libhtp

CWE-401 — Missing Release of Memory after Effective Lifetime6 documents5 sources

Severity

7.5HIGHNVD

EPSS

0.1%

top 65.20%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Oisf Libhtp

Timeline

PublishedJul 23

Latest updateOct 9

Description

LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces. In versions 0.5.50 and below, there is a traffic-induced memory leak that can starve the process of memory, leading to loss of visibility. To workaround this issue, set `suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-enabled` to false. This issue is fixed in version 0.5.51.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶CVEListV5oisf/libhtp< 0.5.51

▶NVDoisf/libhtp< 0.5.51

▶Debianoisf/libhtp< 1:0.5.50-1+deb13u1+1

▶Ubuntuoisf/libhtp< 0.5.15-1ubuntu0.1~esm1+4

Patches

Patch: github.com ↗

🔴Vulnerability Details

OSV

libhtp vulnerabilities↗2025-10-09

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CVEList

LibHTP's memory leak with lzma can lead to resource starvation↗2025-07-23

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OSV

CVE-2025-53537: LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces↗2025-07-23

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📋Vendor Advisories

Ubuntu

LibHTP vulnerabilities↗2025-10-09

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Debian

CVE-2025-53537: libhtp - LibHTP is a security-aware parser for the HTTP protocol and its related bits and...↗2025

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