Cross-Site HTTP Redirect Vulnerability in cpp-httplib by yhirose
CVE-2026-33745

7.4HIGH

Key Information:

Vendor

Yhirose

Status
Cpp-httplib
Vendor
CVE Published:
27 March 2026

What is CVE-2026-33745?

The cpp-httplib library, used for HTTP/HTTPS communication, is vulnerable to a security flaw where it forwards authentication credentials to unintended hosts during cross-origin HTTP redirects. This issue can be exploited by malicious servers capable of redirecting clients, leading to the exposure of sensitive plaintext credentials contained in the 'Authorization' header. Users are advised to upgrade to version 0.39.0 or later to safeguard against this vulnerability.

Affected Version(s)

cpp-httplib < 0.39.0

References

https://github.com/yhirose/cpp-httplib/security/advisorie...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.