Vulnerability in Oisf Libhtp
CVE-2025-53537
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Oisf Libhtp — versions < 0.5.51
Weakness classification (CWE)
References
- github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7 (Mitigation, Vendor Advisory)
- github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7 (Patch)
Frequently asked questions
- What is CVE-2025-53537?
- CVE-2025-53537 is a high-severity vulnerability in Oisf Libhtp, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2025-07-23.
- How severe is CVE-2025-53537?
- High severity. CVSS v3 base score is 7.5 out of 10.