EUVD-2026-16515Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
The cpp-httplib HTTP/HTTPS client library (versions prior to 0.39.0) leaks authentication credentials to arbitrary third-party servers when following cross-origin HTTP redirects. An attacker operating a malicious server can issue a 301/302/307/308 redirect to capture plaintext Basic Auth, Bearer Token, or Digest Auth credentials from the Authorization header. CVSS score of 7.4 reflects high confidentiality and integrity impact with network attack vector and high complexity; no public exploit identified at time of analysis.
Technical ContextAI
cpp-httplib is a single-file header-only C++11 cross-platform HTTP/HTTPS library maintained by yhirose. The affected product is identified via CPE cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*. The vulnerability represents CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) where the HTTP client implementation fails to strip authorization credentials when processing cross-origin redirects. RFC 7235 best practices recommend clients avoid sending credentials to different origins, but the library's redirect handling logic did not implement this protection, causing stored authentication material to persist across domain boundaries during automatic redirect following.
RemediationAI
Upgrade cpp-httplib to version 0.39.0 or later, which implements proper credential stripping during cross-origin redirects. The vendor-released patch is available as version 0.39.0 per the GitHub security advisory at https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-6hrp-7fq9-3qv2. For applications unable to upgrade immediately, implement application-layer controls including disabling automatic redirect following and handling redirects manually with explicit credential management logic, validating redirect target origins against an allowlist before retransmitting authentication headers, or using per-origin credential storage rather than global client-level authentication. Review application logs for unexpected cross-origin redirect sequences that may indicate historical credential exposure.
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 16.0 | Fixed |
| SUSE Linux Enterprise Server 16.1 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Fixed |
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External POC / Exploit Code
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