CVE catalog
CVE-2026-53450
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 ca
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | coturn | sid | 4.18.0-1 | fixed |
| Debian | coturn | forky | 4.18.0-1 | fixed |
| Debian | coturn | trixie | 4.6.1-2 | vulnerable |
| Debian | coturn | bookworm | 4.6.1-1 | vulnerable |
| Cpe | coturn | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | coturn | source | sid | 4.14.0-1 | not yet assigned | Not reported | [1142275] |
| Debian | coturn | source | forky | 4.14.0-1 | not yet assigned | Not reported | [1142275] |
| Debian | coturn | source | trixie | (unfixed) | not yet assigned | Not reported | [1142275] |
| Debian | coturn | source | bookworm | (unfixed) | not yet assigned | Not reported | [1142275] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [coturn]Affected
Details (2)
4.6.1-1· amd64 · bookwormAffected
nvd · coturn · debian · bookworm; nvd · coturn · debian · 12
4.6.1-1· arm64 · bookwormAffected
nvd · coturn · debian · bookworm; nvd · coturn · debian · 12
[Debian 13 (Trixie)]
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11617-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-53450]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-53450]
- [https://security-tracker.debian.org/tracker/CVE-2026-53450]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53450.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]