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DEBIAN-CVE-2026-77118

Type: advisorySource: OSV1 source record

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. A 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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-77118

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-77118

graphicsmagick

Source reference: /affected/0/package/name

Affected versions
1.4+really1.3.40-4

Source reference: /affected/0/versions

1.4+really1.3.40-4+deb12u1

Source reference: /affected/0/versions

1.4+really1.3.41-1

Source reference: /affected/0/versions

1.4+really1.3.42-1

Source reference: /affected/0/versions

1.4+really1.3.42-1.1

Source reference: /affected/0/versions

1.4+really1.3.42-1.1~exp1

Source reference: /affected/0/versions

1.4+really1.3.43-1

Source reference: /affected/0/versions

1.4+really1.3.44-1

Source reference: /affected/0/versions

1.4+really1.3.45+hg17689-1

Source reference: /affected/0/versions

1.4+really1.3.45+hg17692-1

Source reference: /affected/0/versions

1.4+really1.3.45+hg17696-1

Source reference: /affected/0/versions

1.4+really1.3.45-1

Source reference: /affected/0/versions

1.4+really1.3.46-1

Source reference: /affected/0/versions

1.4+really1.3.46-2

Source reference: /affected/0/versions

1.4+really1.3.48-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

graphicsmagick

Source reference: /affected/1/package/name

Affected versions
1.4+really1.3.45+hg17696-1

Source reference: /affected/1/versions

1.4+really1.3.46-1

Source reference: /affected/1/versions

1.4+really1.3.46-2

Source reference: /affected/1/versions

1.4+really1.3.48-1

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

graphicsmagick

Source reference: /affected/2/package/name

Affected versions
1.4+really1.3.45+hg17696-1

Source reference: /affected/2/versions

1.4+really1.3.46-1

Source reference: /affected/2/versions

1.4+really1.3.46-2

Source reference: /affected/2/versions

Fixed versions
1.4+really1.3.48-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "graphicsmagick",
      "purl": "pkg:deb/debian/graphicsmagick?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.4+really1.3.40-4",
      "1.4+really1.3.40-4+deb12u1",
      "1.4+really1.3.41-1",
      "1.4+really1.3.42-1",
      "1.4+really1.3.42-1.1",
      "1.4+really1.3.42-1.1~exp1",
      "1.4+really1.3.43-1",
      "1.4+really1.3.44-1",
      "1.4+really1.3.45+hg17689-1",
      "1.4+really1.3.45+hg17692-1",
      "1.4+really1.3.45+hg17696-1",
      "1.4+really1.3.45-1",
      "1.4+really1.3.46-1",
      "1.4+really1.3.46-2",
      "1.4+really1.3.48-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77118.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "graphicsmagick",
      "purl": "pkg:deb/debian/graphicsmagick?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.4+really1.3.45+hg17696-1",
      "1.4+really1.3.46-1",
      "1.4+really1.3.46-2",
      "1.4+really1.3.48-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77118.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.4+really1.3.48-1"
          }
        ]
      }
    ],
    "package": {
      "name": "graphicsmagick",
      "purl": "pkg:deb/debian/graphicsmagick?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.4+really1.3.45+hg17696-1",
      "1.4+really1.3.46-1",
      "1.4+really1.3.46-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77118.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#58349 · Revision 1
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Publisher date
Read the original announcement