CVE-2022-23641Network attack vector

Service interruption via unbounded Onebox response parsing

Published Feb 15, 2022 · Updated Apr 23, 2025

Denial of service in Discourse stable through 2.8.0 and beta/tests-passed through 2.9.0.beta1 allows remote authenticated users to exhaust memory. The Onebox background parser follows a posted streaming URL and accepts its HTTP response without enforcing a time or size bound, allowing response buffering to continue indefinitely. A forum account able to create posts is required, and memory exhaustion can interrupt the Discourse service.

CVSS severity6.5
Medium
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Discourse stable through 2.8.0 and beta/tests-passed through 2.9.0.beta1 allows remote authenticated users to exhaust memory. The Onebox background parser follows a posted streaming URL and accepts its HTTP response without enforcing a time or size bound, allowing response buffering to continue indefinitely. A forum account able to create posts is required, and memory exhaustion can interrupt the Discourse service.

The record

CVE
CVE-2022-23641
Published
Feb 15, 2022
Updated
Apr 23, 2025
Vendor
Discourse
Product
Discourse
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=beta <= 2.9.0.beta1
  2. Affected versionversion=stable <= 2.8.0
  3. Affected versionversion=tests-passed <= 2.9.0.beta1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=beta <= 2.9.0.beta1; version=stable <= 2.8.0; version=tests-passed <= 2.9.0.beta1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

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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