CVE-2026-77118 (GCVE-0-2026-77118)

Vulnerability from cvelistv5 – Published: 2026-08-20 12:42 – Updated: 2026-08-20 12:56
VLAI
Title
Out-of-bounds write in GraphicsMagick PCD decoder
Summary
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.
CWE
Impacted products
Vendor Product Version CPE status
GraphicsMagick Group GraphicsMagick Affected: 1.0.0 , < 1.3.48 (semver)
    cpe:2.3:a:graphicsmagick:graphicsmagick:*:*:*:*:*:*:*:*
Create a notification for this product.
Debian graphicsmagick Affected: 0 , < 1.4+really1.3.48-1 (deb)
    cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:12:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:13:*:*:*:*:*:*:*
Create a notification for this product.
Fedora Project GraphicsMagick Affected: 0 , < 1.3.48 (rpm)
    cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
    cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-20 09:43
Show details on NVD website

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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Cipher - Causal Security (https://causalsecurity.com/), who discovered the defect and reported it to the GraphicsMagick maintainer on 2026-06-14"
        },
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          "type": "remediation developer",
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      "datePublic": "2026-08-20T09:43:00.000Z",
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              "value": "\u003cp\u003eA heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In \u003ccode\u003eDecodeImage()\u003c/code\u003e (\u003ccode\u003ecoders/pcd.c\u003c/code\u003e), the Huffman delta loop advances its output pointer with \u003ccode\u003eq++\u003c/code\u003e 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.\u003c/p\u003e\u003cp\u003eA 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 \u2014 for example with \u003ccode\u003egm convert\u003c/code\u003e or \u003ccode\u003egm identify\u003c/code\u003e, or through any application linked against libGraphicsMagick \u2014 can corrupt heap memory beyond the buffers.\u003c/p\u003e"
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            "Recovery": "NOT_DEFINED",
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          "name": "Upstream fix (released in 1.3.48)",
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    "cveId": "CVE-2026-77118",
    "datePublished": "2026-08-20T12:42:42.952Z",
    "dateReserved": "2026-08-20T12:40:51.495Z",
    "dateUpdated": "2026-08-20T12:56:01.246Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "current_release_date": "2026-08-22T12:09:01+00:00",
      "cve": "CVE-2026-77118",
      "id": "CVE-2026-77118",
      "initial_release_date": "2026-08-20T12:42:42.952000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "GraphicsMagick: GraphicsMagick: Arbitrary code execution via crafted PCD file",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77118.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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