CVE-2026-81624Network attack vectorHinoki check available

Unauthenticated server crash via unlimited WebSocket resources

Published Aug 31, 2026 · Updated Aug 31, 2026

Resource exhaustion in Undertow WebSocket handling allows remote attackers to crash affected Red Hat application servers. WebSocketDeploymentInfo supplies no finite defaults, while Bootstrap propagates unlimited buffer sizes and omits idle-timeout enforcement. An unauthenticated attacker needs network access to a deployed WebSocket endpoint and can consume memory with oversized messages or retain resources through idle connections.

CVSS severity7.5
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in Undertow WebSocket handling allows remote attackers to crash affected Red Hat application servers. WebSocketDeploymentInfo supplies no finite defaults, while Bootstrap propagates unlimited buffer sizes and omits idle-timeout enforcement. An unauthenticated attacker needs network access to a deployed WebSocket endpoint and can consume memory with oversized messages or retain resources through idle connections.

The record

CVE
CVE-2026-81624
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
389 Directory Server
Product
Red Hat JBoss Enterprise Application Platform Expansion Pack
Classifications
CWE-770, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat JBoss Enterprise Application Platform Expansion PackAffected versions are unavailable in this record.
389 Directory Server · Red Hat build of Apache Camel for Spring BootAffected versions are unavailable in this record.
389 Directory Server · Red Hat Single Sign-On 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Fuse 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat JBoss Enterprise Application PlatformAffected versions are unavailable in this record.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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