What’s Vulnerable › Vulnerabilities

CVE-2026-102944: cpp-httplib: Cookie header leaked on cross-origin redirect

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-522

Description

cpp-httplib is a C++ header-only HTTP/HTTPS library. Prior to 0.51.0, create_redirect_client() removes Host, Proxy-Authorization, and Authorization headers when following a cross-origin 301, 302, 307, or 308 redirect but leaves Cookie headers attached. detail::redirect() copies the request for those redirect codes, so cookies supplied directly or through default_headers_ are sent to the redirect target. An attacker who controls a redirect response, or a network position for a non-HTTPS origin, can receive session cookies intended for the original origin. A 303 redirect is not affected because that path clears all request headers. This issue is fixed in version 0.51.0.

Affected products

• yhirose cpp-httplib: before 0.51.0

References

• https://github.com/yhirose/cpp-httplib/commit/0c1cc8c9866bb567ff11c1cd0d09779e8c5f8585
• https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-22mf-w2v3-r2jv
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-22mf-w2v3-r2jv

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