{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.10.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "753afbbee1682f5d16fd30e87b31058a4fd4f4b8"
            },
            {
              "fixed": "0aadfc23407f50e770eb5ddd871fc208f5626833"
            }
          ],
          "repo": "https://github.com/op-tee/optee_os",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71967.json"
  },
  "details": "OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA open_session handler that allows Normal World clients to cause a denial of service when CFG_WIDEVINE_PTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via is_user_ta_ctx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.",
  "id": "CVE-2026-71967",
  "modified": "2026-08-15T04:06:54.467734587Z",
  "published": "2026-08-10T18:11:01.124Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71967.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71967"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/op-tee-os-null-pointer-dereference-dos-via-widevine-pta-open-session"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OP-TEE/optee_os/pull/7899"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OP-TEE/optee_os/commit/0aadfc23407f50e770eb5ddd871fc208f5626833"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OP-TEE/optee_os"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session"
}