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ImageMagick has a NULL pointer dereference in MSL parser via <comment> tag before image load

  • Publicada: 21.01.2026
  • Actualizado: 11.10.2026 11:23

Summary

NULL pointer dereference in MSL (Magick Scripting Language) parser when processing <comment> tag before any image is loaded.

Version

  • ImageMagick 7.x (tested on current main branch)
  • Commit: HEAD

Steps to Reproduce

Method 1: Using ImageMagick directly

bash
magick MSL:poc.msl out.png

Method 2: Using OSS-Fuzz reproduce

bash
python3 infra/helper.py build_fuzzers imagemagick
python3 infra/helper.py reproduce imagemagick msl_fuzzer poc.msl

Or run the fuzzer directly:

bash
./msl_fuzzer poc.msl

Expected Behavior

ImageMagick should handle the malformed MSL gracefully and return an error message.

Actual Behavior

convert: MagickCore/property.c:297: MagickBooleanType DeleteImageProperty(Image *, const char *): Assertion `image != (Image *) NULL' failed.
Aborted

Root Cause Analysis

In coders/msl.c:7091, MSLEndElement() calls DeleteImageProperty() on msl_info->image[n] when handling the </comment> end tag without checking if the image is NULL:

c
if (LocaleCompare((const char *) tag,"comment") == 0 )
  {
    (void) DeleteImageProperty(msl_info->image[n],"comment");  // No NULL check
    ...
  }

When <comment> appears before any <read> operation, msl_info->image[n] is NULL, causing the assertion failure in DeleteImageProperty() at property.c:297.

Impact

  • DoS: Crash via assertion failure (debug builds) or NULL pointer dereference (release builds)
  • Affected: Any application using ImageMagick to process user-supplied MSL files

Fuzzer

This issue was discovered using a custom MSL fuzzer:

cpp
#include <cstdint>
#include <Magick++/Blob.h>
#include <Magick++/Image.h>
#include "utils.cc"

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
  if (IsInvalidSize(Size))
    return(0);
  try
  {
    const Magick::Blob blob(Data, Size);
    Magick::Image image;
    image.magick("MSL");
    image.fileName("MSL:");
    image.read(blob);
  }
  catch (Magick::Exception)
  {
  }
  return(0);
}

This issue was found by Team FuzzingBrain @ Texas A&M University

Software afectado

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PlataformaPaqueteVersiones vulnerablesCorregida en
.NET (NuGet) Magick.NET-Q16-AnyCPU < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-AnyCPU < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-OpenMP-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-OpenMP-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-HDRI-x86 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-OpenMP-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-OpenMP-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-OpenMP-x86 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q16-x86 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-AnyCPU < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-OpenMP-arm64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-OpenMP-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-x64 < 14.10.2 14.10.2
.NET (NuGet) Magick.NET-Q8-x86 < 14.10.2 14.10.2

Referencias

Puntuación CVSS 6.5/10
Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Debilidad (CWE)
CWE-476
Plataforma
.NET (NuGet)
Paquete
Magick.NET-Q16-AnyCPU, Magick.NET-Q16-arm64, Magick.NET-Q16-HDRI-AnyCPU
Publicada
21.01.2026
Actualizado
11.10.2026 11:23

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-5vx3-wx4q-6cj8 - CC BY 4.0

Historial de vulnerabilidades: Magick.NET-Q16-AnyCPU

Todas las vulnerabilidades publicadas de este paquete (.NET (NuGet)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Todas (165) en el archivo
Entradas en total
165
Primera → última
09.2023 09.2026
Sin corrección
0
Explotada en ataques
1

Distribución por gravedad

  • Alta 27
  • Media 99
  • Baja 39

Divulgaciones por año

Gravedad:
  1. ImageMagick has out-of-bounds write in ICON decoder due to incorrect loop
    Alta · 7.5 CVE-2026-53461 < 14.14.0 14.14.0
  2. ImageMagick: Policy Bypass can Trigger an Out-of-Memory condition
    Alta · 7.5 CVE-2026-53460 < 14.14.0 14.14.0
  3. ImageMagick: Policy Bypass in DCM decoder could result in image with invalid dimensions
    Alta · 7.5 CVE-2026-49218 < 14.14.0 14.14.0
  4. ImageMagick: Infinite Loop in the MIFF decoder can lead to CPU exhaustion
    Alta · 7.5 CVE-2026-46522 < 14.13.1 14.13.1
  5. ImageMagick: Heap Buffer Over-Write in IPL decoder when reading multiple images of different dimensions
    Alta · 7.5 CVE-2026-46520 < 14.13.1 14.13.1
  6. ImageMagick has a heap Buffer Overflow in ImageMagick MVG decoder
    Alta · 7.5 CVE-2026-33901 < 14.12.0 14.12.0
  7. ImageMagick has a Stack Overflow in DestroyXMLTree()
    Alta · 7.5 CVE-2026-33908 < 14.12.0 14.12.0
  8. ImageMagick has stack buffer overflow in MagnifyImage
    Alta · 7.7 CVE-2026-30929 < 14.10.4 14.10.4
  9. ImageMagick: Integer overflow in DIB coder can result in out of bounds read or write
    Alta · 8.1 CVE-2026-28693 < 14.10.4 14.10.4
  10. ImageMagick has uninitialized pointer dereference in JBIG decoder
    Alta · 7.5 CVE-2026-28691 < 14.10.4 14.10.4
  11. ImageMagick vulnerable to stack corruption through long morphology kernel names or arrays
    Alta · 7.1 CVE-2026-28494 < 14.10.4 14.10.4
  12. ImageMagick: MSL attribute stack buffer overflow leads to out of bounds write.
    Alta · 7.4 CVE-2026-25968 < 14.10.3 14.10.3
  13. ImageMagick: Integer overflow or wraparound and incorrect conversion between numeric types in the internal SVG decoder
    Alta · 7.5 CVE-2026-25989 < 14.10.3 14.10.3
  14. ImageMagick: Memory allocation with excessive without limits in the internal SVG decoder
    Alta · 7.5 CVE-2026-25985 < 14.10.3 14.10.3
  15. ImageMagick: Stack buffer overflow in FTXT reader via oversized integer field
    Alta · 7.4 CVE-2026-25967 < 14.10.3 14.10.3
  16. ImageMagick: Policy bypass through path traversal allows reading restricted content despite secured policy
    Alta · 8.6 CVE-2026-25965 < 14.10.3 14.10.3
  17. ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions
    Alta · 8.2 CVE-2026-25794 < 14.10.3 14.10.3
  18. ImageMagick: Infinite loop vulnerability when parsing a PCD file
    Alta · 7.5 CVE-2026-24485 < 14.10.3 14.10.3
  19. ImageMagick has Possible Heap Information Disclosure in PSD ZIP Decompression
    Alta · 7.5 CVE-2026-24481 < 14.10.3 14.10.3
  20. ImageMagick has a NULL pointer dereference in MSL parser via <comment> tag before image load esta entrada
    Media · 6.5 CVE-2026-23952 < 14.10.2 14.10.2
  21. ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)
    Alta · 7.5 CVE-2025-66628 < 14.10.0 14.10.0
  22. ImageMagick (WriteBMPImage): 32-bit integer overflow when writing BMP scanline stride → heap buffer overflow
    Alta · 7.5 CVE-2025-57803 < 14.8.1 14.8.1
  23. ImageMagick has a Format String Bug in InterpretImageFilename leads to arbitrary code execution
    Alta · 7.5 CVE-2025-55298 < 14.8.1 14.8.1
  24. imagemagick: integer overflows in MNG magnification
    Alta · 8.8 CVE-2025-55154 < 14.8.0 14.8.0
  25. imagemagick: heap-buffer overflow read in MNG magnification with alpha
    Alta · 7.6 CVE-2025-55004 < 14.8.0 14.8.0
  26. ImageMagick has a Stack Buffer Overflow in image.c
    Alta · 7.4 CVE-2025-53101 < 14.7.0 14.7.0
  27. ImageMagick has XMP profile write that triggers hang due to unbounded loop
    Alta · 7.5 CVE-2025-53015 < 14.7.0 14.7.0
  28. libwebp: OOB write in BuildHuffmanTable
    Alta · 8.8 Explotada en ataques CVE-2023-4863 < 13.3.0 13.3.0

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