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Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade syncthing | Aug 22, 2024 | Apr 6, 2021 |
| Debian | — | Upgrade syncthing | Jul 30, 2024 | Apr 6, 2021 |
| Freebsd | — | Upgrade syncthing | Nov 4, 2022 | Apr 12, 2021 |
| Suse | — | Upgrade syncthingUpgrade syncthing-relaysrv | May 9, 2021 | Apr 6, 2021 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Apr 6, 2021 |
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