{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:freeswitch:freeswitch:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.11.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c2c59645f6911a76589e5008c4d73349ded44b65"
            }
          ],
          "repo": "https://github.com/signalwire/freeswitch",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9457-fxr9-x78m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-287"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49843.json"
  },
  "details": "FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, mod_verto's JSON-RPC handler bound the connection to the client-supplied sessid on the first frame, before the authentication gate. Binding inserts the connection into the global session hash and, on a key collision, drops the prior occupant of that slot — sending it a verto.punt, detaching its calls, and closing its socket. An unauthenticated network attacker who knows a target session UUID could therefore evict the legitimate client. This issue has been patched in version 1.11.1.",
  "id": "CVE-2026-49843",
  "modified": "2026-08-12T03:51:09.674812244Z",
  "published": "2026-06-09T16:04:55.308Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/signalwire/freeswitch/releases/tag/v1.11.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49843.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/signalwire/freeswitch/security/advisories/GHSA-9457-fxr9-x78m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49843"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FreeSWITCH: Pre-authentication session eviction via attacker-chosen `sessid` in `mod_verto`"
}