CVE-2026-53450: Coturn is a free open source implementation of TURN and STUN Server

Q: How do I fix CVE-2026-53450?

coturn: upgrade to 4.13.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-53450 being exploited?

CVE-2026-53450 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-53450 affect?

CVE-2026-53450 affects coturn. Severity is high (CVSS 7.4). 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 I

Routine

HIGH 7.4UPGRADE

CVE-2026-53450 is a high-severity flaw (CVSS 7.4) affecting coturn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 def

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-07-10
Last modified	2026-07-16

Publisher (CNA): GitHub, Inc. · Vendor: coturn project

Last updated 2026-07-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-10 19:17 UTCPublished CVE record published
2026-07-16 19:29 UTCUpdated Record last modified

coturn project coturn UPGRADE

Affected: < 4.13.0

Fixed in: 4.13.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coturn || rpm -q coturn || coturn --version

2. UPGRADE to 4.13.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade coturn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade coturn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53450?

coturn: upgrade to 4.13.0. Exact commands for each OS are on this page.

Is CVE-2026-53450 being exploited?

CVE-2026-53450 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53450 affect?

CVE-2026-53450 affects coturn. Severity is high (CVSS 7.4). 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 I

How urgent is CVE-2026-53450?

Priority 31/100. High severity

Related CVEs

CVE-2026-53448 HIGH 7.2 UPGRADE Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-53449 MEDIUM 6.0 UPGRADE Coturn is a free open source implementation of TURN and STUN Server

References

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