High severity · published Jul 23, 2025
CVE-2025-53537
LibHTP is a security-aware parser for the HTTP protocol and its related bits and pieces
7.5
CVSS
0.5%
EPSS
No
On KEV
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:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libhtp · Oisf
before 0.5.51 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-53537
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-53537
Patch
https://github.com/OISF/libhtp/commit/9037ea35110a0d97be5cedf8d31fb4cd9a38c7a7
Mitigation
https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7
More from Libhtp
9.8
CVE-2018-10243
htp_parse_authorization_digest in htp_parsers.c in LibHTP 0.5.26 allows remote attackers to cause a heap-based buffer over-read via an authorization digest header
7.5
CVE-2024-45797
LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces
7.5
CVE-2024-28871
LibHTP is a security-aware parser for the HTTP protocol and the related bits and pieces
7.5
CVE-2024-23837
LibHTP is a security-aware parser for the HTTP protocol
7.5
CVE-2015-0928
libhtp 0.5.15 allows remote attackers to cause a denial of service (NULL pointer dereference)