Memory Allocation Vulnerability in cpp-httplib by Yhirose
CVE-2025-53629

7.5HIGH

Key Information:

Vendor

Yhirose

Status
Cpp-httplib
Vendor
CVE Published:
10 July 2025

What is CVE-2025-53629?

The cpp-httplib is a C++11 single-file header-only cross-platform HTTP/HTTPS library that contains a vulnerability related to the handling of incoming requests using 'Transfer-Encoding: chunked'. Before version 0.23.0, the library's server can allocate memory in an unrestricted manner, which can result in memory exhaustion, jeopardizing the performance and availability of applications relying on this library. This issue highlights the importance of updating to the latest version to mitigate potential risks.

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Affected Version(s)

cpp-httplib < 0.23.0

References

https://github.com/yhirose/cpp-httplib/security/advisorie...
x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/security/advisorie...
x_refsource_MISC
https://github.com/yhirose/cpp-httplib/commit/17ba303889b...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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