# CVE-2026-53449: Coturn: Arbitrary File Write via CLI psd Command

> An authenticated admin can overwrite arbitrary files via the CLI psd command due to lack of path validation, potentially leading to code execution.

- **Severity:** Medium 6.0 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-53449, GHSA-jj76-vwjw-w34r, UBUNTU-CVE-2026-53449

## What is CVE-2026-53449?

CVE-2026-53449 is a medium-severity path traversal vulnerability in coturn, published on 10 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-53449?

It affects 1 product.


Products: Coturn Project Coturn.

## How do I fix CVE-2026-53449?

Upgrade to a fixed version.

## Is CVE-2026-53449 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53449 exists.

## Other vulnerabilities in coturn

- [CVE-2018-4056](https://insights.sbomify.com/CVE-2018-4056/): SQL injection in coTURN (critical 9.1)
- [CVE-2026-43994](https://insights.sbomify.com/CVE-2026-43994/): Coturn: Stack buffer overflow in decode_oauth_token_gcm() (high 8.1)
- [CVE-2018-4058](https://insights.sbomify.com/CVE-2018-4058/): Server-side request forgery in coTURN (high 7.7)
- [CVE-2026-40613](https://insights.sbomify.com/CVE-2026-40613/): Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64) (high 7.5)
- [CVE-2026-53450](https://insights.sbomify.com/CVE-2026-53450/): Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53449 and fix it if it is affected.

What it is: CVE-2026-53449 is a medium-severity path traversal vulnerability in coturn, published on 10 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53449 exists.

Affected product: coturn. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53449/ (Markdown: https://insights.sbomify.com/CVE-2026-53449/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53449
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53449
- OSV: https://osv.dev/vulnerability/CVE-2026-53449

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53449/
Summaries are generated and may contain mistakes; the official description above is the record.