yhirose cpp-httplib 0.21.0 resource consumption

Summaryinfo

A vulnerability categorized as problematic has been discovered in yhirose cpp-httplib 0.21.0. Impacted is an unknown function. Such manipulation leads to resource consumption. This vulnerability is referenced as CVE-2025-52887. It is possible to launch the attack remotely. No exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in yhirose cpp-httplib 0.21.0. It has been rated as problematic. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In version 0.21.0, when many http headers fields are passed in, the library does not limit the number of headers, and the memory associated with the headers will not be released when the connection is disconnected. This leads to potential exhaustion of system memory and results in a server crash or unresponsiveness. Version 0.22.0 contains a patch for the issue.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-52887 since 06/20/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 276219 (TencentOS Server 4: cpp-httplib (TSSA-2025:0524)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 28dcf379e82a2cdb544d812696a7fd46067eb7f9 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Tenable (276219) and EUVD (EUVD-2025-19196). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• yhirose

Name

• cpp-httplib

Version

• 0.21.0

License

• open-source

Website

• Product: https://github.com/yhirose/cpp-httplib/

CPE 2.3info

• 🔍

CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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