Security advisory

{
  "id": "8af5574df6750619d5cab5bbd9555a0ca84f3af28a2d5b27337419a3de10a318",
  "url": "https://osv.dev/vulnerability/CVE-2026-26399",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-26399",
    "summary": "A stack-use-after-return issue exists in the Arduino_Core_STM32 library prior to version 1.7.0. The pwm_start() function allocates a TIM_HandleTypeDef structure on the stack and passes its address to HAL initialization routines, where it is stored in a global timer handle registry. After the function returns, interrupt service routines may dereference this dangling pointer, resulting in memory corruption.",
    "evidence": "osv:CVE-2026-26399",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-26399",
      "aliases": [
        "CVE-2026-26399"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stm32duino/arduino_core_stm32",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5e43e63e80519c971217285718539ef3b6189a14"
                },
                {
                  "fixed": "e6a56b3dec4ac1b715ca5eb94f0b51678be9cc60"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.7.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e6a56b3dec4ac1b715ca5eb94f0b51678be9cc60"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.6.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.6.0",
            "1.5.0",
            "1.4.0",
            "1.3.0",
            "1.2.0",
            "2018.1.18",
            "1.1.1",
            "2017.11.24",
            "1.1.0",
            "2017.9.22",
            "1.0.1",
            "2017.8.31",
            "1.0.0",
            "STM32-2017.8.4",
            "0.2.1",
            "STM32-2017.7.13",
            "0.2.0",
            "STM32-2017.6.2",
            "0.1.1",
            "STM32-2017.5.12",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26399.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.797919394Z",
      "provider": "osv",
      "references": [
        "https://github.com/stm32duino/Arduino_Core_STM32/releases/tag/1.6.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26399.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26399",
        "https://github.com/Acen28/CVE-2026-26399-Disclosure"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26399.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-26399",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499898,
  "published_at": "2026-04-20T00:00:00+00:00"
}