Format string error in coTURN - CVE-2026-68553
Published: August 3, 2026
Vulnerability identifier: #VU140777
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68553
CWE-ID: CWE-134
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information and cause a denial of service.
The vulnerability exists due to use of externally-controlled format string in hiredis Redis command handling when processing crafted TURN USERNAME or REALM attributes in Redis-backed allocation reporting. A remote user can send crafted authentication values containing format specifiers to disclose sensitive information and cause a denial of service.
Exploitation requires valid low-privilege TURN credentials and a coTURN deployment configured with Redis statistics integration.
Affected software
coTURN
How to mitigate CVE-2026-68553
Install security update from vendor's website.
coTURN - update to 4.13.0