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CVE-2025-53537— LibHTP's memory leak with lzma can lead to resource starvation

Quick assessment

Affected
OISF libhtp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibHTP是Open Information Security基金会的一款安全感知解析器。该产品主要用于HTTP协议等。 LibHTP 0.5.50及之前版本存在安全漏洞，该漏洞源于内存泄漏问题，可能导致进程内存耗尽。

CVSS 7.5 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-53537

Vulnerability Information
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Vulnerability Title
LibHTP's memory leak with lzma can lead to resource starvation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
LibHTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibHTP是Open Information Security基金会的一款安全感知解析器。该产品主要用于HTTP协议等。 LibHTP 0.5.50及之前版本存在安全漏洞，该漏洞源于内存泄漏问题，可能导致进程内存耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF libhtp < 0.5.51 -

II. Public POCs for CVE-2025-53537

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9378 chars
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III. Intelligence Information for CVE-2025-53537

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IV. Related Vulnerabilities

Same product: libhtp
Same vendor: OISF
Same weakness: CWE-401

V. Comments for CVE-2025-53537

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