CVEvulnerability

CVE-2026-45372

9.9 CRITICAL Published 2026-05-29 Modified 2026-07-22 Official page ↗
Status
Modified
Published
2026-05-29
Last modified
2026-07-22
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
Weaknesses
CWE-444, CWE-93

Description

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 configurations

• yhirose cpp-httplib (< 0.44.0)

Related

Weakness · CWE (2)

  • CWE-444 Inconsistent Interpretation of HTTP Requests weakness
  • CWE-93 Improper Neutralization of CRLF Sequences weakness

References