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.

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.

EPSS: 0.004 (34.4th percentile) — read the EPSS interpretation.

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.

Affected products

Oisf Libhtp — versions < 0.5.51

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

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.