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CVE-2026-53450— Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection

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 4.13.0之前版本存在服务端请求伪造漏洞，该漏洞源于默认的环回保护可以被绕过，通过使用IPv4映射的IPv6环回地址，使得善意的对等地址不应用默认的环回拒绝，可能导致经过身份验证的TURN客户端通过TURN中继流量暴露仅在本地主机上绑定的服务。

CVSS 7.4 · High EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1572 · Protocol Tunneling

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.13.0 affected
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I. Basic Information for CVE-2026-53450

Vulnerability Information
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Vulnerability Title
Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection
Source: CVE Program / CVE List V5
Vulnerability Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, coturn rejects loopback peers by default unless allow-loopback-peers is enabled, but the default loopback guard can be bypassed by using the IPv4-mapped IPv6 peer address ::ffff:127.0.0.1 in a TURN XOR-PEER-ADDRESS attribute. ioa_addr_is_loopback checks for the literal IPv6 loopback shape before IPv4-mapped IPv6 handling, so good_peer_addr does not apply the default loopback rejection and an authenticated TURN client can expose services bound only to localhost on the coturn host through TURN relay traffic. This issue is fixed in version 4.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 服务端请求伪造漏洞
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 4.13.0之前版本存在服务端请求伪造漏洞，该漏洞源于默认的环回保护可以被绕过，通过使用IPv4映射的IPv6环回地址，使得善意的对等地址不应用默认的环回拒绝，可能导致经过身份验证的TURN客户端通过TURN中继流量暴露仅在本地主机上绑定的服务。
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 < 4.13.0 -

II. Public POCs for CVE-2026-53450

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10449 chars
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III. Intelligence Information for CVE-2026-53450

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Patches & Fixes for CVE-2026-53450 (1)

Vendor Advisories for CVE-2026-53450 (1)

Same Patch Batch · coturn · 2026-07-10 · 3 CVEs total

CVE-2026-53448 7.2 HIGH Coturn: SQL Injection in HTTPS Admin Panel Delete Operations
CVE-2026-53449 6.0 MEDIUM Coturn: Arbitrary File Write via CLI psd Command

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-918

V. Comments for CVE-2026-53450

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