CVE-2026-61854

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CVE-2026-61854

Summary: VoiceSentinel: Race condition in report buffer cleanup can corrupt transcript data and cause unbounded disk growth

Details: VoiceSentinel is a real-time voice moderation system for Minecraft servers. From 2.2.1 until 3.3.1, the optional report buffer feature has a race between retention cleanup and normal transcript writes. In `report_buffer.py`, `_maybe_cleanup()` uses an unlocked dictionary for once-per-hour cleanup throttling, allowing simultaneous `_cleanup_tenant()` operations for one tenant. Cleanup reads `transcripts.jsonl` and rewrites it in place without file locking or atomic replacement, while `report_buffer_append_async` uses `asyncio.to_thread` to append without synchronization. In `main.py`, concurrent `_processing_worker` tasks make this reachable in normal operation; `processing.worker_count` of two or more and public-pool servers sharing a `server_key` increase collisions. With `report_buffer.enabled` set to true, racing writes can lose, duplicate or corrupt transcript data and defeat `report_buffer.retention_seconds` pruning, allowing unbounded disk growth that can exhaust storage and crash the host or other services sharing it. The feature is opt-in and disabled by default. This issue is fixed in version 3.3.1.

References: https://github.com/jackh54/VoiceSentinel/releases/tag/v3.3.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61854.json, https://github.com/jackh54/VoiceSentinel/security/advisories/GHSA-vhqx-3242-77j7, https://nvd.nist.gov/vuln/detail/CVE-2026-61854, https://github.com/jackh54/VoiceSentinel/commit/a8c9f926d19969a19d05eee2a508719aea7f109c