CVE-2022-41921 Discourse chat messages should have a maximum character limit

What is CVE-2022-41921?

CVE-2022-41921 is a low-severity denial of service vulnerability in Discourse Discourse, published on 28 Nov 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Discourse is an open-source discussion platform. Prior to version 2.9.0.beta13, users can post chat messages of an unlimited length, which can cause a denial of service for other users when posting huge amounts of text. Users should upgrade to version 2.9.0.beta13, where a limit has been introduced. No known workarounds are available.

Weakness: CWE-770, CWE-20

Which versions are affected by CVE-2022-41921?

1 open source package ship an affected version, including discourse. It affects 1 product.

Products include Discourse Discourse.

How do I fix CVE-2022-41921?

Upgrade discourse to 2.9.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-41921 being exploited?

There is no known exploitation of CVE-2022-41921 in the wild and no public exploit code.

Other vulnerabilities in Discourse Discourse

• CVE-2021-41163 RCE via malicious SNS subscription payload Critical 10.0
• CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file Critical 9.1
• CVE-2022-39356 Discourse user account takeover via email and invite link High 8.9
• CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes High 8.8
• CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint High 8.7

All Discourse Discourse vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-discourse-2022-41921, GHSA-mfh7-6cv6-qccc.