---
id: CVE-2026-102944
title: cpp-httplib is a C++ header-only HTTP/HTTPS library
summary: >-
  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 he…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-522
vendor: yhirose
product: cpp-httplib
affected:
  - cpp-httplib < 0.51.0
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:04:29.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102944'
references:
  - url: >-
      https://github.com/yhirose/cpp-httplib/commit/0c1cc8c9866bb567ff11c1cd0d09779e8c5f8585
    label: security-advisories@github.com
  - url: 'https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-22mf-w2v3-r2jv
    label: security-advisories@github.com
  - url: >-
      https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-22mf-w2v3-r2jv
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102944.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102944'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-102944'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - exploit-available
epss: 0.00434
epssPercentile: 0.37527
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-15T14:40:31.550021Z'
ingestedAt: '2026-10-14T19:49:57.605Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102944.json)