CVE-2025-53629CWE-770

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

High · published July 10, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
47.8
In the wild
Unconfirmed
What it is

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.

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
0.00594 · 47.8th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2025-07-10T19:46Z
EPSS history
Timeline
  • 10 JUL 19:46Z
    cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability
    cvelistv5