# CVE-2026-53449: Coturn arbitrary file write in CLI psd command

Source: https://junglewise.ai/threats/cve-2026-53449-coturn-arbitrary-file-write-in-cli-psd-command  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-10. Updated: 2026-07-10  
License: CC BY 4.0 with a link back

CVE-2026-53449 · Severity: medium · CVSS 6 · Published 2026-07-10

Coturn is an open-source server used to facilitate audio and video communication (WebRTC) across different network types. A security flaw in its administrative command-line interface allows an authorized administrator to overwrite any file on the server that the Coturn software has permission to access. This could be used to corrupt system configurations, delete security certificates, or cause a service outage.

Technologies: [Coturn](https://junglewise.ai/threats/technologies/coturn). Vendors: [Coturn](https://junglewise.ai/threats/vendors/coturn).

## Quick answers

**Is CVE-2026-53449 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-53449 being exploited in the wild.

**How severe is CVE-2026-53449?** Medium severity, with a CVSS score of 6, published 10 July 2026.

**Which products and versions are affected?** Coturn < 4.13.0.

**Is there a fix for CVE-2026-53449?** A patch was published on 2026-06-13: Version 4.13.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-53449 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-53449?** Check whether you run Coturn at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal and arbitrary file write vulnerability exists in the 'psd' (print sessions dump) command within Coturn's administrative CLI. The 'turn_admin_server.c' component fails to validate the filename argument before passing it to the 'fopen' function with write ('w') permissions. An attacker with valid CLI administrator credentials can exploit this to truncate and overwrite arbitrary files writable by the Coturn process user, such as configuration files or TLS certificates. The attack requires access to the admin interface, which is bound to localhost by default. The issue was resolved in version 4.13.0 by removing the 'psd' command and its associated file-writing functionality.

## Affected products

- coturn coturn < 4.13.0

## Timeline

- 2026-06-13: patched: Version 4.13.0 released
- 2026-06-26: advisory: GitHub Security Advisory GHSA-jj76-vwjw-w34r published
- 2026-07-10: disclosed: CVE-2026-53449 published to NVD

## References

- [https://github.com/coturn/coturn/commit/e72930f571beba3bc7a9f97661af2614aae92a55](https://github.com/coturn/coturn/commit/e72930f571beba3bc7a9f97661af2614aae92a55)
- [https://github.com/coturn/coturn/releases/tag/4.13.0](https://github.com/coturn/coturn/releases/tag/4.13.0)
- [https://github.com/coturn/coturn/security/advisories/GHSA-jj76-vwjw-w34r](https://github.com/coturn/coturn/security/advisories/GHSA-jj76-vwjw-w34r)

## Related threats

- [Coturn quota bypass in mobility-enabled allocations](https://junglewise.ai/threats/cve-2026-73216-coturn-quota-bypass-in-mobility-enabled-allocations)
- [Coturn EVEN-PORT relay port exhaustion](https://junglewise.ai/threats/cve-2026-73215-coturn-even-port-relay-port-exhaustion)
- [Coturn DTLS memory exhaustion via fragmented ClientHello](https://junglewise.ai/threats/cve-2026-73214-coturn-dtls-memory-exhaustion-via-fragmented-clienthello)
- [Coturn IPv6 range check bypass in TURN relay](https://junglewise.ai/threats/cve-2026-73213-coturn-ipv6-range-check-bypass-in-turn-relay)
- [Coturn TURN/STUN relay ACL bypass via IPv6 address encoding](https://junglewise.ai/threats/cve-2026-73212-coturn-turn-stun-relay-acl-bypass-via-ipv6-address-encoding)