CVE-2025-52887CWE-400

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

High · published June 26, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
41.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00490 · 41.2th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2025-06-26T14:31Z
EPSS history
Timeline
  • 26 JUN 14:31Z
    cpp-httplib has unlimited number of http header fields, which causes memory leak
    cvelistv5