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CVE-2026-62959— Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)

Quick assessment

Affected
coturn coturn
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的开源实现。 Coturn 4.5.2版本至4.14.0版本存在安全漏洞，该漏洞源于有符号到无符号转换错误，可能导致未经身份验证的远程客户端发送单个HTTP GET请求，获取包含相邻进程堆内存的301响应，泄漏回收未清零的网络接收缓冲区中的敏感数据（如TURN凭据、OAuth令牌）。

CVSS 8.2 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn >= 4.5.2, < 4.15.0 affected
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I. Basic Information for CVE-2026-62959

Vulnerability Information
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Vulnerability Title
Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的开源实现。 Coturn 4.5.2版本至4.14.0版本存在安全漏洞，该漏洞源于有符号到无符号转换错误，可能导致未经身份验证的远程客户端发送单个HTTP GET请求，获取包含相邻进程堆内存的301响应，泄漏回收未清零的网络接收缓冲区中的敏感数据（如TURN凭据、OAuth令牌）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coturn coturn >= 4.5.2, < 4.15.0 -

II. Public POCs for CVE-2026-62959

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12776 chars
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III. Intelligence Information for CVE-2026-62959

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Patches & Fixes for CVE-2026-62959 (2)

Vendor Advisories for CVE-2026-62959 (1)

Vendor Pages for CVE-2026-62959 (1)

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-125

V. Comments for CVE-2026-62959

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