# CVE-2026-62959

## Summary

- **CVE ID:** CVE-2026-62959
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-125, CWE-195
- **Published:** Jul 31, 2026
- **Last Modified:** Jul 31, 2026

## Description

Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.

## Affected Products

- coturn — coturn (>= 4.5.2, < 4.15.0)

## References

- [CNA](https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g)
- [CNA](https://github.com/coturn/coturn/pull/1965)
- [CNA](https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4)
- [CNA](https://github.com/coturn/coturn/releases/tag/4.15.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._