Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-68552— Coturn: uint16_t truncation overflow in STUN message length causes TCP stream framing bypass

Quick assessment

Affected
coturn coturn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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组织开源的一款实现TURN协议的服务器软件。 Coturn 4.15.0之前版本存在数字错误漏洞，该漏洞源于src/client/ns_turn_msg.c文件中的stun_get_message_len_str()函数对STUN消息body-length字段处理不当导致整数溢出，可能允许未经身份验证的远程攻击者通过TCP或TLS发送特制STUN消息，导致流解析器失步并断开攻击客户端连接，造成拒绝服务。

CVSS 5.3 · Medium EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.15.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-68552

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Coturn: uint16_t truncation overflow in STUN message length causes TCP stream framing bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款实现TURN协议的服务器软件。 Coturn 4.15.0之前版本存在数字错误漏洞，该漏洞源于src/client/ns_turn_msg.c文件中的stun_get_message_len_str()函数对STUN消息body-length字段处理不当导致整数溢出，可能允许未经身份验证的远程攻击者通过TCP或TLS发送特制STUN消息，导致流解析器失步并断开攻击客户端连接，造成拒绝服务。
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 < 4.15.0 -

II. Public POCs for CVE-2026-68552

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-68552

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-68552 (2)

Vendor Advisories for CVE-2026-68552 (1)

Vendor Pages for CVE-2026-68552 (1)

Same Patch Batch · coturn · 2026-08-19 · 4 CVEs total

CVE-2026-68553 7.1 HIGH Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command
CVE-2026-68555 6.5 MEDIUM coturn: Chained mobility resumes allow authenticated remote memory exhaustion
CVE-2026-68554 2.3 LOW Coturn: STUN attributes after MESSAGE-INTEGRITY are processed, letting on-path attackers m

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-190

V. Comments for CVE-2026-68552

No comments yet

Leave a comment