CVE-2025-52887: cpp-httplib has unlimited number of http header fields, which causes memory leak
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.
Affected Software
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Event History
Frequently Asked Questions
What is the severity of CVE-2025-52887?
CVE-2025-52887 has been classified as a high severity vulnerability due to a potential denial of service caused by unbounded memory usage.
How do I fix CVE-2025-52887?
To fix CVE-2025-52887, upgrade to version 0.22.0 or later of the cpp-httplib library where the issue is resolved.
What are the potential impacts of CVE-2025-52887?
The impact of CVE-2025-52887 includes excessive memory consumption leading to denial of service, which can disrupt application performance.
Which versions of cpp-httplib are affected by CVE-2025-52887?
CVE-2025-52887 affects versions prior to 0.22.0 of the cpp-httplib library.
Is there a workaround for CVE-2025-52887?
A recommended workaround for CVE-2025-52887 is to limit the number of HTTP header fields processed in your application until an upgrade can be applied.