CVE catalog
CVE-2026-68554
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
- Severity
- Medium · CVSS 5.4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.19% · Oct 25, 2026
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.
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 |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | coturn | source | sid | 4.15.0-1 | not yet assigned | Not reported | Not reported |
| Debian | coturn | source | forky | 4.15.0-1 | not yet assigned | Not reported | Not reported |
| Debian | coturn | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | coturn | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
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://github.com/coturn/coturn/commit/ab762f334f511ea37ab4b703a47d5d683a5be978]
- [https://github.com/coturn/coturn/releases/tag/4.15.0]
- [https://github.com/coturn/coturn/security/advisories/GHSA-5538-7cxj-5jcc]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-68554]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-68554]
- [https://security-tracker.debian.org/tracker/CVE-2026-68554]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68554.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]