CVE-2025-52887

cpp-httplib has unlimited number of http header fields, which causes memory leak

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Affected: yhirose cpp-httplib
Published at:
Updated at:

References

Link Tags
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjhg-gf59-p92h
https://github.com/yhirose/cpp-httplib/commit/28dcf379e82a2cdb544d812696a7fd46067eb7f9

Frequently Asked Questions

What is the severity of CVE-2025-52887?
CVE-2025-52887 has been scored as a high severity vulnerability.
How to fix CVE-2025-52887?
To fix CVE-2025-52887, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-52887 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-52887 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-52887?
CVE-2025-52887 affects yhirose cpp-httplib.
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