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CVE-2026-53450

Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection

Published: Jul 10, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-918
7.4HIGH
NVD MITRE
EPSS Score
0.2%
Top 93.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-918

Affected Products

coturn
oss-project
coturnOn-prem
Networking Infrastructure / load-balancer-proxy
coturn project
oss-project
coturnOn-prem
Networking Infrastructure

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Command and Control
Initial Access
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References

https://github.com/coturn/coturn/security/advisories/GHSA-w4hf-cr3w-6h79
github.com
https://github.com/coturn/coturn/commit/b057acbebe721c8f2f202ddad5e16289e295c754
github.com

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