CVE-2026-40339

{
  "id": "CVE-2026-40339",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-18T00:16:37.947",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read in `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 842). The function reads the FormFlag byte via `dtoh8o(data, *poffset)` without a prior bounds check. The standard `ptp_unpack_DPD()` at lines 686–687 correctly validates `*offset + sizeof(uint8_t) > dpdlen` before this same read, but the Sony variant omits this check entirely. Commit 09f8a940b1e418b5693f5c11e3016a1ad2cea62d fixes the issue."
    },
    {
      "lang": "es",
      "value": "libgphoto2 es una biblioteca de acceso y control de cámaras. Las versiones hasta la 2.5.33 inclusive tienen una lectura fuera de límites en “ptp_unpack_Sony_DPD()” en “camlibs/ptp2/ptp-pack.c” (línea 842). La función lee el byte FormFlag a través de “dtoh8o(data, poffset)” sin una comprobación de límites previa. La función estándar “ptp_unpack_DPD()” en las líneas 686-687 valida correctamente “offset + sizeof(uint8_t) > dpdlen” antes de esta misma lectura, pero la variante de Sony omite esta comprobación por completo. El commit 09f8a940b1e418b5693f5c11e3016a1ad2cea62d corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gphoto",
          "product": "libgphoto2",
          "versions": [
            {
              "version": "<= 2.5.33",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L",
          "baseScore": 5.2,
          "baseSeverity": "MEDIUM",
          "attackVector": "PHYSICAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 4.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-20T14:51:42.764789Z",
          "id": "CVE-2026-40339",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/gphoto/libgphoto2/commit/09f8a940b1e418b5693f5c11e3016a1ad2cea62d",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/gphoto/libgphoto2/security/advisories/GHSA-42cm-m9hc-r7q8",
      "source": "[email protected]"
    }
  ]
}