CVE-2026-53449: coturn — Exploit & Fix

Description

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, the psd print sessions dump CLI command in coturn takes a filename argument and directly passes it to fopen with no path validation. An authenticated admin with CLI access can overwrite arbitrary files writable by the coturn process because the command string is used as-is after stripping the psd prefix and leading spaces, allowing truncation and overwrite with session dump data. This issue is fixed in version 4.13.0.

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CVSS v3.1 Score

6.0

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-73 CWE-73

Affected Products

Vendor	Product	Versions
coturn_project	coturn	< 4.13.0

References

Advisories & Patches

https://github.com/coturn/coturn/commit/e72930f571beba3bc7a9f97661af2614aae92a55

Exploits

https://github.com/coturn/coturn/security/advisories/GHSA-jj76-vwjw-w34r https://github.com/coturn/coturn/security/advisories/GHSA-jj76-vwjw-w34r

Other References

https://github.com/coturn/coturn/releases/tag/4.13.0

Frequently Asked Questions

What is CVE-2026-53449? +

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, the psd print sessions dump CLI command in coturn takes a filename argument and directly passes it to fopen with no path validation. An authenticated admin with CLI access can overwrite arbitrary files writable by the coturn process because the command string is used as-is after stripping the psd prefix and leading spaces, allowing truncation and overwrite with session dump data. This issue is fixed in version 4.13.0. It has a CVSS v3.1 base score of 6.0 (MEDIUM).

How severe is CVE-2026-53449? +

CVE-2026-53449 has a CVSS v3.1 score of 6.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0021, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-53449? +

CVE-2026-53449 affects products from coturn_project, specifically: coturn. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-53449? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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