CVE-2026-33745 - cpp-httplib Client Leaks Authentication Credentials to Untrusted Hosts on Cross-Origin HTTP Redirect · CoreCVE

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HIGH

cpp-httplib Client Leaks Authentication Credentials to Untrusted Hosts on Cross-Origin HTTP Redirect

Published Mar 27, 2026

7.4

HIGH

CVSS 3.1

EPSS 0.35%

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.

Affected products

Vendor Yhirose Product Cpp-Httplib Default
n/a
- Version
  < 0.39.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

n/a

Version	Status	Constraints
< 0.39.0	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-200

Exposure of Sensitive Information

References (1)

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-6hrp-7fq9-3qv2
x_refsource_CONFIRMExploitMitigationVendor Advisory

Link	Providers	Tags
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-6hrp-7fq9-3qv2		x_refsource_CONFIRMExploitMitigationVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner GitHub_M

Published Mar 27, 2026

Updated Apr 1, 2026

Reserved Mar 23, 2026

Link CVE-2026-33745

CISA Vulnrichment

Updated Mar 30, 2026

Status Analyzed

Modified Jun 17, 2026

Link CVE-2026-33745

Severity n/a

Public date n/a

Links CVE-2026-33745