CVE-2026-62959

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Source
https://cve.org/CVERecord?id=CVE-2026-62959
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62959.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-62959
Aliases
  • GHSA-m23x-5qf5-988g
Downstream
Published
2026-07-31T19:57:06.394Z
Modified
2026-08-01T11:45:31.629124300Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)
Details

Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.

Database specific 
{
    "cwe_ids": [
        "CWE-125",
        "CWE-195"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62959.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/coturn/coturn

Affected ranges

Type
GIT
Repo
https://github.com/coturn/coturn
Events
Introduced
b31bb041191f10d2ef6488caad6a4ef03a51f1fc
Fixed
ac6a9633b16a1a35ab248570484e52d138515ad5
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "4.5.2"
        },
        {
            "fixed": "4.15.0"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62959.json"