CVE-2026-77118

{
  "id": "CVE-2026-77118",
  "sourceIdentifier": "22e2d327-25fe-45d7-9f0c-dcd23b7108df",
  "published": "2026-08-20T13:19:07.077",
  "lastModified": "2026-10-27T10:10:00.240",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is repositioned only when a sync marker introduces a new plane/row; between sync markers the run length is bounded solely by the input.\n\n\n\nA crafted PCD file that positions the pointer near the end of a plane and then supplies a long run of deltas with no intervening sync therefore walks the pointer past the end of the allocation and writes through it. Processing an untrusted PCD file — for example with gm convert or gm identify, or through any application linked against libGraphicsMagick — can corrupt heap memory beyond the buffers."
    },
    {
      "lang": "es",
      "value": "Existe una escritura fuera de límites en el heap en el decodificador de Photo CD (PCD) de GraphicsMagick. En DecodeImage() (coders/pcd.c), el bucle de delta de Huffman avanza su puntero de salida con q++ después de cada delta decodificado y nunca lo verifica contra el final de los búferes de plano de luma/croma asignados en el heap. El puntero se reposiciona solo cuando un marcador de sincronización introduce un nuevo plano/fila; entre marcadores de sincronización, la longitud de la ejecución está limitada únicamente por la entrada.\n\nUn archivo PCD manipulado que posiciona el puntero cerca del final de un plano y luego suministra una larga secuencia de deltas sin sincronización intermedia, por lo tanto, mueve el puntero más allá del final de la asignación y escribe a través de él. Procesar un archivo PCD no confiable - por ejemplo, con gm convert o gm identify, o a través de cualquier aplicación enlazada con libGraphicsMagick - puede corromper la memoria del heap más allá de los búferes."
    }
  ],
  "affected": [
    {
      "source": "22e2d327-25fe-45d7-9f0c-dcd23b7108df",
      "affectedData": [
        {
          "vendor": "GraphicsMagick Group",
          "product": "GraphicsMagick",
          "defaultStatus": "unaffected",
          "cpes": [
            "cpe:2.3:a:graphicsmagick:graphicsmagick:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "PCD / PCDS image coder"
          ],
          "platforms": [
            "Linux",
            "Windows",
            "macOS"
          ],
          "programFiles": [
            "coders/pcd.c"
          ],
          "programRoutines": [
            {
              "name": "DecodeImage"
            }
          ],
          "repo": "https://foss.heptapod.net/graphicsmagick/graphicsmagick",
          "versions": [
            {
              "version": "1.0.0",
              "lessThan": "1.3.48",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Debian",
          "product": "graphicsmagick",
          "defaultStatus": "unaffected",
          "collectionURL": "https://packages.debian.org",
          "packageName": "graphicsmagick",
          "cpes": [
            "cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*",
            "cpe:2.3:o:debian:debian_linux:12:*:*:*:*:*:*:*",
            "cpe:2.3:o:debian:debian_linux:13:*:*:*:*:*:*:*"
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "1.4+really1.3.48-1",
              "versionType": "deb",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Fedora Project",
          "product": "GraphicsMagick",
          "defaultStatus": "unaffected",
          "collectionURL": "https://dl.fedoraproject.org/pub/epel",
          "packageName": "GraphicsMagick",
          "cpes": [
            "cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*"
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "1.3.48",
              "versionType": "rpm",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "22e2d327-25fe-45d7-9f0c-dcd23b7108df",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "userInteraction": "ACTIVE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-26T19:42:13.414822Z",
          "id": "CVE-2026-77118",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "22e2d327-25fe-45d7-9f0c-dcd23b7108df",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/commit/937cdd9920bd96",
      "source": "22e2d327-25fe-45d7-9f0c-dcd23b7108df"
    },
    {
      "url": "https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/raw/GraphicsMagick-1_3_48/ChangeLog",
      "source": "22e2d327-25fe-45d7-9f0c-dcd23b7108df"
    }
  ]
}