High
async-http-client — security advisory
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.
- Products
- async-http-client
- Affected versions
- 1.6.5-1, 1.6.5-2, 1.6.5-2ubuntu0.1~esm1, 1.6.5-4, 1.6.5-5, 2.12.2-1, 2.12.3-1, 2.12.3-1ubuntu0.22.04.1, 2.12.3-1ubuntu0.24.04.1, 2.12.3-1ubuntu1, 2.12.3-1ubuntu1.1, 2.6.0-1, 2.6.0-1ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-107227
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:54 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-107227
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
async-http-client
Fixed versions: Not specified
Complete source record
{
"id": "ceb822bdebe0c11ee40cdba008e49904073fca286fc6ade558cd0fc1dd8c2307",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-107227",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-107227",
"summary": "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.",
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"severity": "high",
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"modified": "2026-10-17T12:59:48.138512840Z",
"provider": "osv",
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-107227",
"https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-x8v2-478q-2hvg",
"https://github.com/AsyncHttpClient/async-http-client/commit/b61637f30327f314b7693418f12ce141ac6b2b30",
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"source_id": "core-osv",
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"published_at": "2026-10-07T21:17:00+00:00"
}