CVE-2025-66577

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can supply X-Forwarded-For or X-Real-IP headers which get accepted unconditionally by get_client_ip() in docker/main.cc, causing access and error logs (nginx_access_logger / nginx_error_logger) to record spoofed client IPs (log poisoning / audit evasion). This vulnerability is fixed in 0.27.0.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee333ce8bf13523f487bdfad9518a2aff	Patch
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2025-12-05 19:15

Updated : 2025-12-11 18:09

NVD link : CVE-2025-66577

Mitre link : CVE-2025-66577

CVE.ORG link : CVE-2025-66577

JSON object : View

Products Affected

yhirose

cpp-httplib

CWE

CWE-117

Improper Output Neutralization for Logs

CWE-807

Reliance on Untrusted Inputs in a Security Decision

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