Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coturn | coturn | < 4.17.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | coturn | 4.18.0-1 | — |
| Debian 13 | coturn | No fix yet | — |
| Debian 12 | coturn | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | coturn | No fix yet | — |
| Ubuntu 26.04 LTS | coturn | No fix yet | — |
| Ubuntu 24.04 LTS | coturn | No fix yet | — |
| Ubuntu 22.04 LTS | coturn | No fix yet | — |
| Ubuntu 20.04 LTS | coturn | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | coturn | No fix yet | — |
| Ubuntu 16.04 LTS | coturn | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | coturn | 4.17.2-1.1 | openSUSE-SU-2026:11617-1 |
Advisories 1
- openSUSE-SU-2026:11617-1 coturn-4.17.2-1.1 on GA media SUSE / openSUSE Security Updates · Aug 28, 2026