CVE-2026-33745

HIGH

7.4

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.

CVE Details

CVSS v3.1 Score7.4

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published3/27/2026

Last Modified4/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

yhirose:cpp-httplib

Weaknesses (CWE)

CWE-200

References

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-6hrp-7fq9-3qv2(security-advisories@github.com)

IOC Correlations

No correlations recorded

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