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.

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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

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