Resource exhaustion in Yhirose Cpp-httplib
CVE-2025-53629
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 e…
EPSS: 0.006 (68.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Yhirose Cpp-httplib — versions < 0.23.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6w (x_refsource_CONFIRM)
- https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw (x_refsource_MISC)
- https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-53629?
- CVE-2025-53629 is a high-severity vulnerability in Yhirose Cpp-httplib, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-07-10.
- How severe is CVE-2025-53629?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-53629 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.