CVE-2025-68934 Discourse Has Denial of Service (DoS) Vulnerability in Drafts Creation Endpoint
Authenticated users can cause denial of service by submitting crafted payloads to the drafts endpoint, exhausting shared worker resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68934?
CVE-2025-68934 is a medium-severity denial of service vulnerability in Discourse Discourse, published on 28 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, authenticated users can submit crafted payloads to /drafts.json that cause O(n^2) processing in Base62.decode, tying up workers for 35-60 seconds per request. This affects all users as the shared worker pool becomes exhausted. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Lowering the max_draft_length site setting reduces attack surface but does not fully mitigate the issue, as payloads under the limit can still trigger the slow code path.
Weakness: CWE-770
Which versions are affected by CVE-2025-68934?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 3.5.4, 2025.11.2, 2026.1.0 |
Products include Discourse Discourse.
How do I fix CVE-2025-68934?
Upgrade discourse to a fixed version for your release line: 3.5.4, 2025.11.2 or 2026.1.0.
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-2025-68934 being exploited?
There is no known exploitation of CVE-2025-68934 in the wild and no public exploit code.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Sources
Also known as BIT-discourse-2025-68934, GHSA-vwjh-vrx9-9849.