LibHTP's memory leak with lzma can lead to resource starvation

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.

Scores

EPSS (exploitation in 30 days)

0.50% · top 57% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• CWE-401: Missing Release of Memory after Effective Lifetime (opens in a new tab)All about CWE-401 and its CVEs

Affected products

• OISF · libhtp

  • affected < 0.5.51

References (2)

• https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7 (opens in a new tab)x_refsource_CONFIRM
• https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-53537](https://trackcve.app/badge/CVE-2025-53537.svg)](https://trackcve.app/cve/CVE-2025-53537)

Record last updated 23 Jul 2025, 20:48 UTC.