Vulnerability · Published Jul 10, 2025 · Assigned by GitHub_M
CVE-2025-53629cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability
High 7.5
In plain English
A high-severity resource allocation without limits in cpp-httplib from yhirose. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cpp-httplib | no fix listed | DEBIAN-CVE-2025-53629 |
| Debian:13 | cpp-httplib | 0.18.7-1+deb13u1 | DEBIAN-CVE-2025-53629 |
| Debian:14 | cpp-httplib | 0.25.0+ds-3 | DEBIAN-CVE-2025-53629 |
| Ubuntu:25.10 | cpp-httplib | no fix listed | UBUNTU-CVE-2025-53629 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| yhirose | cpp-httplib | < 0.23.0 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H