{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.1.0"
              },
              {
                "last_affected": "2.1.1"
              },
              {
                "fixed": "2.1.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "a72a76f234d9f7069ddd1e8b8ebef30a9c3fa326"
            },
            {
              "fixed": "510a23adbc911e8e72708799daba964ec045ef25"
            }
          ],
          "repo": "https://github.com/chipsalliance/caliptra-sw",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-49mm-5gq5-v97f"
  ],
  "database_specific": {
    "cna_assigner": "Caliptra",
    "cwe_ids": [
      "CWE-20",
      "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11835.json"
  },
  "details": "Time-of-check time-of-use (TOCTOU) vulnerability combined with missing input validation in Caliptra Core ROM (UpdateResetFlow::run()) in subsystem mode allows a compromised local attacker to silently bypass secure boot by supplying an AXI staging address that is not validated against the strap-configured SS_EXTERNAL_STAGING_AREA_BASE_ADDR, enabling firmware to be modified between verification and loading into ICCM. Attestation continues to report the originally verified image digest, masking the compromise. Exploitation requires a compromised MCU firmware with AXI manager access to unprotected SRAM reachable by Caliptra.\n\nThis issue affects Core ROM: 2.1.0 through 2.1.1.",
  "id": "CVE-2026-11835",
  "modified": "2026-08-07T11:31:08.123394970Z",
  "published": "2026-08-04T00:03:23.278Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11835.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-49mm-5gq5-v97f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11835"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chipsalliance/caliptra-sw"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Caliptra Update-Reset Secure-Boot Bypass via Attacker-Chosen AXI Staging Address (TOCTOU)"
}