Description

ImageMagick has a Memory Leak in magick stream

Summary

In ImageMagick's magick stream command, specifying multiple consecutive %d format specifiers in a filename template causes a memory leak.

Details

Vulnerability Type: Memory leak

Affected Version: ImageMagick 7.1.1-47 (as of commit 82572afc, June 2025)

Reproduction

Tested Environment

Operating System: Ubuntu 22.04 LTS

Architecture: x86_64

Compiler: gcc with AddressSanitizer (gcc version: 11.4.0)

Reproduction Steps

# Clone source
git clone --depth 1 --branch 7.1.1-47 https://github.com/ImageMagick/ImageMagick.git ImageMagick-7.1.1
cd ImageMagick-7.1.1

# Build with ASan
CFLAGS="-g -O0 -fsanitize=address -fno-omit-frame-pointer" CXXFLAGS="$CFLAGS" LDFLAGS="-fsanitize=address" ./configure --enable-maintainer-mode --enable-shared && make -j$(nproc) && make install

# Trigger crash...
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Output

$ magick stream %d%d a a
stream: no decode delegate for this image format `' @ error/constitute.c/ReadImage/746.
stream: missing an image filename `a' @ error/stream.c/StreamImageCommand/755.

=================================================================
==114==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 152 byte(s) in 1 object(s) allocated from:...
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Commits

Fixed in https://github.com/ImageMagick/ImageMagick/commit/fc3ab0812edef903bbb2473c0ee652ddfd04fe5c and https://github.com/ImageMagick/ImageMagick6/commit/d49460522669232159c2269fa64f73ed30555c1b

Mitigation

Aliases

References