CVE-2026-68553

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Source
https://cve.org/CVERecord?id=CVE-2026-68553
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68553.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-68553
Aliases
  • GHSA-4g7c-p5wg-j4hp
Downstream
Related
Published
2026-08-19T20:37:42Z
Modified
2026-09-11T08:36:43Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
Summary
Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command
Details

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-134"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68553.json"
}
References

Affected packages

Git / github.com/coturn/coturn

Affected ranges

Type
GIT
Repo
https://github.com/coturn/coturn
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8fa38032bb4751e11e072d65a8eca3c06c950979
Fixed
bd02141ad865830fdea420ca0c803edf5ba8240c
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.13.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

4.*
4.10.0
4.11.0
4.12.0
4.4.5.3
4.4.5.4
4.5.0.1
4.5.0.2
4.5.0.3
4.5.0.4
4.5.0.5
4.5.0.6
4.5.0.7
4.5.1.0
4.5.1.1
4.5.1.2
4.5.1.3
4.5.2
4.6.0
4.6.2
4.6.3
4.7.0
4.8.0
4.9.0
docker/4.*
docker/4.10.0-r0
docker/4.10.0-r1
docker/4.11.0-r0
docker/4.12.0-r0
docker/4.5.2-r0
docker/4.5.2-r10
docker/4.5.2-r11
docker/4.5.2-r12
docker/4.5.2-r13
docker/4.5.2-r14
docker/4.5.2-r6
docker/4.5.2-r7
docker/4.5.2-r8
docker/4.5.2-r9
docker/4.6.0-r0
docker/4.6.0-r1
docker/4.6.1-r0
docker/4.6.1-r1
docker/4.6.1-r2
docker/4.6.1-r3
docker/4.6.2-r0
docker/4.6.2-r1
docker/4.6.2-r10
docker/4.6.2-r11
docker/4.6.2-r12
docker/4.6.2-r13
docker/4.6.2-r2
docker/4.6.2-r3
docker/4.6.2-r4
docker/4.6.2-r5
docker/4.6.2-r6
docker/4.6.2-r7
docker/4.6.2-r8
docker/4.6.2-r9
docker/4.6.3-r0
docker/4.6.3-r1
docker/4.6.3-r2
docker/4.6.3-r3
docker/4.7.0-r0
docker/4.7.0-r1
docker/4.7.0-r2
docker/4.7.0-r3
docker/4.7.0-r4
docker/4.8.0-r0
docker/4.8.0-r1
docker/4.9.0-r0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68553.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "32006592092507274028534772350769914051",
            "length": 796
        },
        "id": "CVE-2026-68553-3a277461",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979",
        "target": {
            "file": "src/apps/relay/hiredis_libevent2.c",
            "function": "send_message_to_redis"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "7008343823719524246775466739624232925",
                "164326885605320067784527460612092456532",
                "232870857423825754736201196399573553534",
                "277418429990215895891544659365328130642",
                "223364290905603362512525812524757961546",
                "220078280621677000621861036440754135183",
                "305380475780737583159728793496363930162",
                "48689273660248281508479029777550020834",
                "44023742355221023370947280242239325189",
                "224902225402318080177491273361284234280",
                "277312745928741404452372917234012353961",
                "83115179930311507019911035090996567248",
                "257459578524637863462180920100211572474",
                "200770991417903771080054953921960616642"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-68553-88499476",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979",
        "target": {
            "file": "src/apps/relay/hiredis_libevent2.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-11T08:36:43Z"