CVE-2026-33745
High
Description
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.
SeverityHigh
CVSS7.4
Exploit probability—
ProductYhirose Cpp-httplib
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- yhirose cpp-httplib0.39.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yhirose cpp-httplib | v < 0.39.0 | 0.39.0 |
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