EVerest's ISO15118 update_energy_transfer_modes overflow can corrupt EVSE state

{
  "id": "c2eb18377036c05e9b17e8d48aca378d843c976c098edd53b0c2506a0348bfb5",
  "url": "https://osv.dev/vulnerability/CVE-2026-27816",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "EVerest's ISO15118 update_energy_transfer_modes overflow can corrupt EVSE state",
    "summary": "EVerest is an EV charging software stack. Prior to versions to 2026.02.0, ISO15118_chargerImpl::handle_update_energy_transfer_modes copies a variable-length list into a fixed-size array of length 6 without bounds checking. With schema validation disabled by default, oversized MQTT Cmd payloads can trigger out-of-bounds writes and corrupt adjacent EVSE state or crash the process. Version 2026.02.0 contains a patch.",
    "evidence": "osv:CVE-2026-27816",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-27816",
      "aliases": [
        "CVE-2026-27816",
        "GHSA-gq54-j8f4-xj8c"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/everest/everest",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b666184ef94a70008388cdec7ec41c14549e9bad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.02.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2026.02.0-rc4",
            "2026.02.0-rc3",
            "2026.02.0-rc2",
            "2026.02.0-rc1",
            "2025.12.1",
            "2025.12.0",
            "2025.10.0",
            "2025.8.0",
            "2025.9.0",
            "2025.7.0",
            "2025.7.0-rc1",
            "2025.6.0",
            "2025.5.0",
            "2025.4.0-rc1",
            "2025.3.0",
            "2025.2.0",
            "2025.1.0-rc2",
            "2025.1.0-rc1",
            "2024.11.0",
            "2024.10.0",
            "2024.9.0-rc1",
            "2024.8.0",
            "2024.7.1",
            "2024.7.0",
            "2024.6.0-rc2",
            "2024.6.0-rc1",
            "2024.5.0",
            "2024.4.0",
            "2024.3.0-rc1",
            "2024.2.0",
            "2024.1.0",
            "2023.12.0",
            "2023.10.0",
            "2023.9.1",
            "2023.9.0",
            "2023.8.0",
            "2023.7.0",
            "2023.6.0",
            "2023.5.0",
            "2023.3.0",
            "2023.2.1",
            "2023.2.0",
            "2023.1.0",
            "2022.12.1",
            "2022.12.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27816.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.626369957Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27816.json",
        "https://github.com/EVerest/EVerest/security/advisories/GHSA-gq54-j8f4-xj8c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-27816"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27816.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-27816",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519330,
  "published_at": "2026-03-26T16:32:05.363+00:00"
}