Medium
Discourse has race condition when adding users to a group DM
Type: advisorySources: OSV
Discourse is an open-source discussion platform. Prior to versions `3.3.4` on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-24808
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 21:11 UTC · Revision 1
Source evidence
Discourse has race condition when adding users to a group DM
core-osv · Original sourcePublished 26 Mar 2025, 14:08 UTC
Discourse is an open-source discussion platform. Prior to versions `3.3.4` on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.
osv:CVE-2025-24808
Complete source record
{
"id": "594489532e84931865d924d0f032224af5c1a433fc7da071c9da834c83f1565d",
"url": "https://osv.dev/vulnerability/CVE-2025-24808",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Discourse has race condition when adding users to a group DM",
"summary": "Discourse is an open-source discussion platform. Prior to versions `3.3.4` on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.",
"evidence": "osv:CVE-2025-24808",
"products": [],
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"aliases": [
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"GHSA-hfcx-qjw6-573r"
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"modified": "2026-10-28T02:30:39.695032820Z",
"provider": "osv",
"references": [
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"published_at": "2025-03-26T14:08:38.915+00:00"
}