CVE-2025-53629

Public Exploit

cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.

References

Link	Tags
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6w
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw
https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99

Frequently Asked Questions

What is the severity of CVE-2025-53629?: CVE-2025-53629 has been scored as a high severity vulnerability.
How to fix CVE-2025-53629?: To fix CVE-2025-53629, 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-2025-53629 being actively exploited in the wild?: It is possible that CVE-2025-53629 is being exploited or will be exploited in a near future based on public information. 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-2025-53629?: CVE-2025-53629 affects yhirose cpp-httplib.

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Description

Category

CWE-770 – Allocation of Resources Without Limits or Throttling

References

Frequently Asked Questions