CVE-2026-33745
High · 7.4CVSS
7.4
EPSS
0.4%
Published
Mar 27, 2026
CISA due date
—
The record
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-httplib HTTP client forwards stored Basic Auth, Bearer Token, and Digest Auth credentials to arbitrary hosts when following cross-origin HTTP redirects (301/302/307/308). A malicious or compromised server can redirect the client to an attacker-controlled host, which then receives the plaintext credentials in the `Authorization` header. Version 0.39.0 fixes the issue.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | cpp-httplib | 0 | 0.42.0-1.1 |
Related vulnerabilities
- CVE-2026-46527 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-45372 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-34441 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-32627 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-29076 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-28434 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-28435 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Also affects cpp-httplib
- CVE-2026-22776 cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb Also affects cpp-httplib