CVE-2025-53629 HIGH

CVE-2025-53629: cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability

Vendor Yhirose
Product cpp-httplib
Weakness CWE-770 · Uncontrolled resource consumption
Published July 10, 2025
Last update July 10, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 10, 2025 CVE published
July 10, 2025 Record updated