CVE-2026-23538Network attack vector

Service interruption via unlimited WebSocket connections

Published Jul 16, 2026 · Updated Jul 16, 2026

Resource exhaustion in Feast Feature Server before 0.59.0 allows remote attackers to interrupt service through unauthenticated WebSockets. The /ws/chat handler accepts persistent connections without authentication and enforces no connection cap, message-size limit, rate limit, or read timeout. Any network client that can reach the endpoint can hold enough sockets to consume memory, CPU, and file descriptors until legitimate requests fail.

CVSS severity7.5
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Feast Feature Server before 0.59.0 allows remote attackers to interrupt service through unauthenticated WebSockets. The /ws/chat handler accepts persistent connections without authentication and enforces no connection cap, message-size limit, rate limit, or read timeout. Any network client that can reach the endpoint can hold enough sockets to consume memory, CPU, and file descriptors until legitimate requests fail.

The record

CVE
CVE-2026-23538
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
Feast
Product
Feast Feature Server
Classifications
CWE-770, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.59.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Feast · Feast Feature Serverversion=0 <0.59.0

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.

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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
T1499.002Endpoint Denial of Service: Service 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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