CVE-2025-53628— cpp-httplib does not limit the length of a line
Quick assessment
Affected
yhirose cpp-httplib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
cpp-httplib是yhirose个人开发者的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 cpp-httplib 0.20.1之前版本存在安全漏洞，该漏洞源于未限制唯一行长度，可能导致任意内存分配。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-53628
Vulnerability Information
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Vulnerability Title
cpp-httplib does not limit the length of a line
Source: CVE Program / CVE List V5
Vulnerability Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.20.1, cpp-httplib does not have a limit for a unique line, permitting an attacker to explore this to allocate memory arbitrarily. This vulnerability is fixed in 0.20.1. NOTE: This vulnerability is related to CVE-2025-53629.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
cpp-httplib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cpp-httplib是yhirose个人开发者的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 cpp-httplib 0.20.1之前版本存在安全漏洞，该漏洞源于未限制唯一行长度，可能导致任意内存分配。
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 |
|---|---|---|---|---|
| yhirose | cpp-httplib | < 0.20.1 | - |
|
II. Public POCs for CVE-2025-53628
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: cpp-httplib
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CVE-2026-54919
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CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque
Same vendor: yhirose
-
CVE-2026-54919
cpp-httplib: TLS certificate chain verification bypassed for -
CVE-2026-45372
cpp-httplib: HTTP header value percent-decoding in server-si -
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CVE-2026-45352
cpp-httplib DoS: Negative chunk-size in chunked Transfer-Enc -
CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque
Same weakness: CWE-835
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V. Comments for CVE-2025-53628
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