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CVE-2026-68554— Coturn: STUN attributes after MESSAGE-INTEGRITY are processed, letting on-path attackers modify authenticated TURN requests

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之前版本存在安全漏洞，该漏洞源于STUN消息处理中MESSAGE-INTEGRITY校验不充分，攻击者可在明文UDP或TCP上附加LIFETIME、XOR-PEER-ADDRESS或ORIGIN属性，导致覆盖分配生命周期、注入权限或绕过来源检查。

CVSS 2.3 · Low EPSS 0.13% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.15.0 affected
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I. Basic Information for CVE-2026-68554

Vulnerability Information
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Vulnerability Title
Coturn: STUN attributes after MESSAGE-INTEGRITY are processed, letting on-path attackers modify authenticated TURN requests
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 on-path attacker can append attributes after MESSAGE-INTEGRITY to an authenticated STUN request on plain UDP or TCP, adjust the STUN header length, and recompute the unkeyed FINGERPRINT while the original HMAC remains valid because it covers only the message prefix. Server-side parsing in src/server/ns_turn_server.c continues past MESSAGE-INTEGRITY through handle_turn_allocate(), handle_turn_create_permission(), handle_turn_refresh(), and handle_turn_command(), allowing trailing LIFETIME, XOR-PEER-ADDRESS, or ORIGIN attributes to override allocation lifetime, inject a permission, or bypass the origin check. TLS and DTLS deployments prevent this in-transit modification. This issue is fixed in version 4.15.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 输入验证错误漏洞
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之前版本存在安全漏洞，该漏洞源于STUN消息处理中MESSAGE-INTEGRITY校验不充分，攻击者可在明文UDP或TCP上附加LIFETIME、XOR-PEER-ADDRESS或ORIGIN属性，导致覆盖分配生命周期、注入权限或绕过来源检查。
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-2026-68554

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III. Intelligence Information for CVE-2026-68554

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Patches & Fixes for CVE-2026-68554 (1)

Vendor Advisories for CVE-2026-68554 (1)

Vendor Pages for CVE-2026-68554 (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-2026-68552 5.3 MEDIUM Coturn: uint16_t truncation overflow in STUN message length causes TCP stream framing bypa

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-345

V. Comments for CVE-2026-68554

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