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Vulnerability record · CVE-2025-53537 · published 23 July 2025

CVE-2025-53537: Oisf libhtp memory leak vulnerability

Oisf · Libhtp

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.

7.5 CVSS 3.1 High EPSS 0.44% · top 63.7% CWE-401 · Memory leak
7.5CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7 Patch
https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7 MitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-53537), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.