HTTP/HTTPS Library Vulnerability in cpp-httplib by Yhirose
CVE-2025-66577

5.3MEDIUM

Key Information:

Vendor

Yhirose

Status
Cpp-httplib
Vendor
CVE Published:
5 December 2025

What is CVE-2025-66577?

The cpp-httplib library prior to version 0.27.0 contains a vulnerability that allows attacker-controlled HTTP headers, specifically X-Forwarded-For and X-Real-IP, to influence server-visible metadata. This misconfiguration can lead to log poisoning, where spoofed client IPs are recorded in access and error logs, potentially enabling audit evasion and affecting authorization decisions.

Affected Version(s)

cpp-httplib < 0.27.0

References

https://github.com/yhirose/cpp-httplib/security/advisorie...
x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/commit/ac9ebb0ee33...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-66577 : HTTP/HTTPS Library Vulnerability in cpp-httplib by Yhirose