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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: coturn: CVE-2026-68555
Message-ID: <178732133319.183280.10575903996153424326.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Fri, 21 Aug 2026 16:08:53 +0200
Delivered-To: submit@bugs.debian.org

Source: coturn
Version: 4.15.0-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for coturn.

CVE-2026-68555[0]:
| Coturn is a free open source implementation of TURN and STUN Server.
| In 4.15.0, an authenticated TURN user can repeatedly resume one
| allocation from fresh UDP 5-tuples without completing a handoff when
| the server enables --mobility. mobile_begin_transition() in
| src/server/ns_turn_server.c disarms each new session's allocation
| timeout and overwrites the allocation's single mobile_pending_resume
| link, leaving earlier pending sessions unreachable by the cleanup
| path, while copy_auth_parameters() ignores inc_quota() failure. The
| attacker can therefore retain unbounded server-side sessions and
| exhaust process memory even when --user-quota=1 is configured. This
| issue is fixed in version 4.16.0.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-68555
    https://www.cve.org/CVERecord?id=CVE-2026-68555
[1] https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx
[2] https://github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]