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Advisory record · GHSA-x8v2-478q-2hvg

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

CVSS 7.5 HighEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 8 Oct 2026, 16:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.asynchttpclient:async-http-clientMaven>=3.0.0, <3.0.14 || >=2.2.0, <=2.16.13.0.14
Identifiers
GHSA-x8v2-478q-2hvg · CVE-2026-107227
Weakness (CWE)
CWE-400 · CWE-409
Tags
Published
8 Oct 2026
Updated
8 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions 3.0.0 through 3.0.13 and 2.2.0 through 2.16.1 of org.asynchttpclient:async-http-client are affected when WebSocket compression is enabled, since inflated permessage-deflate messages have no size limit. A malicious or compromised WebSocket server, or an attacker on the path of a ws:// connection, can send a small compressed message that inflates to about 2 GiB, exhausting the client's heap. Upgrade to 3.0.14, which adds a limit on decompressed message size. The 2.x line will not receive a fix. Leaving WebSocket compression disabled, the default, avoids the issue.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.