CVE catalog
CVE-2026-40613
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * with
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.12% · Oct 25, 2026
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.
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 |
| Cpe | coturn | Not reported | 4.10.0 | fixed |
| Opensuse | coturn | tumbleweed | 4.17.2-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | coturn | source | sid | 4.12.0-1 | not yet assigned | Not reported | [1134577] |
| Debian | coturn | source | forky | 4.12.0-1 | not yet assigned | Not reported | [1134577] |
| Debian | coturn | source | trixie | (unfixed) | not yet assigned | Not reported | [1134577] |
| Debian | coturn | source | bookworm | (unfixed) | not yet assigned | Not reported | [1134577] |
| Cpe | coturn | cpe | Not reported | 4.10.0 | Not reported | Not reported | Not reported |
| Opensuse | coturn | rpm | tumbleweed | 4.17.2-1.1 | Not reported | OPENSUSE-SU-2026:11617-1 | Not reported |
Notes
[trixie] coturn: Minor issue [bookworm] coturn: Minor issue; unaligned STUN attr pointer casts present in 4.6.1, ARM64-only DoS
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)]
[openSUSE Tumbleweed]
- [coturn-devel]Unknown
Source package: [coturn]
Details (1)
4.17.2-1.1· x86_64 · tumbleweedUnknown · Fixed:
4.17.2-1.1Version impact unknown
nvd · coturn · opensuse · tumbleweed
- [coturn-utils]Unknown
Source package: [coturn]
Details (1)
4.17.2-1.1· x86_64 · tumbleweedUnknown · Fixed:
4.17.2-1.1Version impact unknown
nvd · coturn · opensuse · tumbleweed
- [coturn]Fixed
Source package: [coturn]
Details (1)
4.17.2-1.1· x86_64 · tumbleweedFixed · Fixed:
4.17.2-1.1nvd · coturn · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11617-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-40613]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-40613]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11617-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-40613]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40613.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]