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
Related
Published
2026-07-31T19:57:06Z
Modified
2026-10-28T11:16:53Z
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 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 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-125",
        "CWE-195"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62959.json"
}
References

Affected packages

Git / github.com/coturn/coturn

Affected ranges

Type
GIT
Repo
https://github.com/coturn/coturn
Events
Introduced
b31bb041191f10d2ef6488caad6a4ef03a51f1fc
Fixed
ac6a9633b16a1a35ab248570484e52d138515ad5
Fixed
960835886692fa04cf63ddd970c3f330740c87f4
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "4.5.2"
                },
                {
                    "fixed":  "4.15.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "960835886692fa04cf63ddd970c3f330740c87f4"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "4.15.0",
            "range":  [
                {
                    "fixed":  "ac6a9633b16a1a35ab248570484e52d138515ad5"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62959.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "209722760260066649169495707605800979043",
                "111498605013595963450131904171325185871",
                "258219366226272230453785043017105130812",
                "314421248877585557374169921479631790294",
                "53000060528007318715408289025138138683",
                "216979036966622046135931930965444021667",
                "175662618682397107255866249889247310189",
                "27428451091670390930683215047393561306",
                "184743710816438578326834021423052579035",
                "217265172170610750280637112431630902485",
                "168860268988503544766809033608112532881",
                "145920501221290618445836489755064491234",
                "38378023807977880522818272398970205444",
                "9204716738746021109270487509560042646",
                "52168359280160886357052804711002926472",
                "24055708274090555940690174189952968852",
                "41891068319003057260802179170984814063",
                "267919125420367397112875956157724819055",
                "216116443800016204779119299374457881037",
                "265683948566064318329148254383922533360",
                "260868459493895914349660481472466781844"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-62959-276270ea",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4",
        "target":  {
            "file":  "src/apps/relay/acme.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "203492486094880269058461480558202962769",
            "length":  1499
        },
        "id":  "CVE-2026-62959-2891e026",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4",
        "target":  {
            "file":  "src/apps/relay/acme.c",
            "function":  "try_acme_redirect"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:16:53Z"