Vulnerability DatabaseCVE-2026-45372
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CVE-2026-45372
Published:May 29, 2026
Updated:June 13, 2026
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.
Affected Packages
cpp-httplib (CONAN):
Affected version(s) >=0.5.13 <0.44.0
Fix Suggestion:
Update to version 0.44.0
Related Resources (1)
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
LOW
Subsequent System Integrity
HIGH
Subsequent System Availability
LOW
CVSS v3
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Improper Neutralization of CRLF Sequences ('CRLF Injection')
CWE-93
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-444
EPSS
Base Score:
0.06