---
id: CVE-2026-107284
title: >-
  The AsyncHttpClient (AHC) library allows Java applications to easily execute
  HTTP requests and asynchronously process HTTP responses
summary: >-
  The AsyncHttpClient (AHC) library allows Java applications to easily execute
  HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and
  2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept
  valu…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-345
  - CWE-670
vendor: AsyncHttpClient
product: async-http-client
affected:
  - 'async-http-client >= 3.0.0, < 3.0.12'
  - 'async-http-client >= 2.0.0, < 2.16.1'
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T22:17:04.483'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107284'
references:
  - url: >-
      https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03
    label: security-advisories@github.com
  - url: >-
      https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9
    label: security-advisories@github.com
  - url: >-
      https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
    label: security-advisories@github.com
  - url: >-
      https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12
    label: security-advisories@github.com
  - url: >-
      https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-07T21:54:15.103Z'
---

## Overview

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.

## Remediation

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