CVE-2025-53629

Name: CVE-2025-53629
Creator: NVD / NIST
Published: 2025-07-10T20:15:27.37+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2025-53629 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.51%

39.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Yhirose	Cpp-Httplib	< 0.23.0

References

https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99Patch
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pwNot Applicable
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6wExploit, Vendor Advisory
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6wExploit, Vendor Advisory

Timeline

Published: Jul 10, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-53629?

How severe is CVE-2025-53629?

CVE-2025-53629 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2025-53629?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-53629?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST