| Title | meetecho janus webrtc server 1.4.2-videoroom Race Condition |
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| Description | The VideoRoom plugin's join handler (src/plugins/janus_videoroom.c) with ptype=publisher checks max_publishers against the current publisher count, but does so WITHOUT proper mutex locking. Under concurrent join requests, multiple publishers can simultaneously pass the check before any of them is recorded in the room, resulting in a Time-Of-Check Time-Of-Use (TOCTOU) bypass. Verified on x.x.x.x:8088 (Janus 1.4.2, commit 4602fcc5) on 2026-08-14: created room 8888 with max_publishers=2; sent 8 concurrent join requests with ptype=publisher; result: 7 publishers joined successfully; listparticipants confirmed 48 publishers in room. This allows conference over-subscription (limit bypassed, leading to OOM/DoS), billing bypass, degraded QoS for other publishers. CWE-362: Concurrent Execution using Shared Resource without Proper Synchronization (TOCTOU Race Condition). CVSS 3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H → 7.3 High. Fix: Wrap the check-and-increment sequence in a mutex lock (janus_mutex_lock). |
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| Source | ⚠️ https://github.com/meetecho/janus-gateway/blob/master/src/plugins/janus_videoroom.c |
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| User | qyf20051010 (UID 100545) |
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| Submission | 08/15/2026 15:59 (2 months ago) |
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| Moderation | 10/11/2026 13:26 (2 months later) |
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| Status | Accepted |
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| VulDB entry | 416606 [meetecho janus-gateway up to 1.4.2 VideoRoom janus_videoroom.c race condition] |
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| Points | 20 |
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