Denial of service in cpp-httplib

1) Resource exhaustion

EUVDB-ID: #VU110691

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-46728

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling requests with "Transfer-Encoding: chunked" is used and no Content-Length header is provided. A remote attacker can send specially crafted HTTP requests to trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cpp-httplib: 0.2.0 - 0.20.0

CPE2.3

• cpe:2.3::cpp-httplib_project:cpp-httplib:0.2.0:*:*:*:*:*:*:*
• cpe:2.3::cpp-httplib_project:cpp-httplib:0.2.1:*:*:*:*:*:*:*
• cpe:2.3::cpp-httplib_project:cpp-httplib:0.2.2:*:*:*:*:*:*:*

External links

https://github.com/yhirose/cpp-httplib/commit/7b752106ac42bd5b907793950d9125a0972c8e8e
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-px83-72rx-v57c

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.