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CVE-2026-107227— AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled

Quick assessment

Affected

AsyncHttpClient async-http-client

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AsyncHttpClient（AHC）库允许 Java 应用程序轻松执行 HTTP 请求并异步处理 HTTP 响应。从版本 2.2.0 至 3.0.14，当启用压缩时，WebSocket 的 permessage-deflate 解压缩操作没有大小限制。由于入站管道在 WebSocketClientCompressionHandler 对压缩帧进行解压缩之前会将其聚合，因此 webSocketMaxFrameSize 和 webSocketMaxBufferSize 参数无法对解压缩后的输出施加限制。恶意 Web

CVSS 7.5 · High Updated Oct 08, 2026

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

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Vulnerability Information

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Vulnerability Title

AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled

Source: CVE Program / CVE List V5

Vulnerability Description

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.2.0 until 3.0.14, WebSocket permessage-deflate decompression is unbounded when compression is enabled. The inbound pipeline aggregates compressed frames before WebSocketClientCompressionHandler inflates them, so webSocketMaxFrameSize and webSocketMaxBufferSize do not bound decompressed output. A malicious WebSocket peer can send a small compressed message that expands to a very large Netty buffer and exhausts JVM heap. This issue is fixed in version 3.0.14.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
AsyncHttpClient	async-http-client	>= 3.0.0, < 3.0.14	-

II. Public POCs for CVE-2026-107227

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III. Intelligence Information for CVE-2026-107227

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Other References for CVE-2026-107227 (3)

https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-x8v2-478q-2hvg x_refsource_CONFIRM
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14 x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/b61637f30327f314b7693418f12ce141ac6b2b30 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-107227

Same Patch Batch · AsyncHttpClient · 2026-10-07 · 13 CVEs total

CVE-2026-107282	9.4 CRITICAL	AsyncHttpClient: Replay to a different host sends the original host request and credential
CVE-2026-107279	8.8 HIGH	AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-
CVE-2026-107231	8.7 HIGH	AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the
CVE-2026-107281	7.6 HIGH	AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Nego
CVE-2026-107232	7.5 HIGH	AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT
CVE-2026-107230	7.4 HIGH	AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy l
CVE-2026-107280	6.9 MEDIUM	AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so
CVE-2026-107228	6.8 MEDIUM	AsyncHttpClient CookieStore Silently Overrides Caller's Explicit Cookie Header via setHead
CVE-2026-107285	5.9 MEDIUM	AsyncHttpClient: WebSocket proxy credentials sent to the origin server over a CONNECT tunn
CVE-2026-107229	4.0 MEDIUM	AsyncHttpClient: Incomplete origin checks in the default cookie store allow cookie tossing
CVE-2026-107284	3.7 LOW	AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
CVE-2026-107283	3.7 LOW	AsyncHttpClient: Digest authentication cnonce generated with a non-cryptographic random so

IV. Related Vulnerabilities

Same product: async-http-client

Same vendor: AsyncHttpClient

Same weakness: CWE-400

V. Comments for CVE-2026-107227

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-107227— AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-107227

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-107227

III. Intelligence Information for CVE-2026-107227

Other References for CVE-2026-107227 (3)

Same Patch Batch · AsyncHttpClient · 2026-10-07 · 13 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-107227

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