---
id: CVE-2026-77358
title: cpp-httplib is a C++ header-only HTTP/HTTPS library
summary: >-
  cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0
  through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before
  closing the WebSocket that still uses it, producing a use-after-free. In
  WebSocketClien…
severity: none
cwe:
  - CWE-416
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77358'
references:
  - url: >-
      https://github.com/yhirose/cpp-httplib/commit/2f986fd5e56e7c5f686d965174516360930f371d
    label: security-advisories@github.com
  - url: >-
      https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-w7p7-f35j-mw7q
    label: security-advisories@github.com
  - url: >-
      https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-w7p7-f35j-mw7q
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00287
epssPercentile: 0.21482
ingestedAt: '2026-09-09T21:22:45.557Z'
---

## Overview

cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.

## Remediation

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