CVE-2026-56364

ImageMagick before 7.1.2-13 contains a memory leak vulnerability in LoadOpenCLDeviceBenchmark() function when parsing malformed OpenCL device profile XML files with unclosed device elements. Attackers with write access to the OpenCL cache directory can place malicious XML files to exhaust memory and cause denial of service.

Summary

A memory leak vulnerability exists in the LoadOpenCLDeviceBenchmark() function in MagickCore/opencl.c. When parsing a malformed OpenCL device profile XML file that contains <device elements without proper /> closing tags, the function fails to release allocated memory for string members (platform_name, vendor_name, name, version), leading to memory leaks that could result in resource exhaustion.

Affected Version: ImageMagick 7.1.2-12 and possibly earlier versions

Details

The vulnerability is located in MagickCore/opencl.c, function LoadOpenCLDeviceBenchmark() (lines 754-911).

Root Cause Analysis:

1. When a <device tag is encountered, a MagickCLDeviceBenchmark structure is allocated (line 807-812)
2. String attributes (platform, vendor, name, version) are allocated via ConstantString() (lines 878, 885, 898, 900)
3. These strings are only freed when a /> closing tag is encountered (lines 840-849)
4. At function exit (lines 908-910), only the device_benchmark structure is freed, but its member variables are not freed if /> was never parsed

Vulnerable Code (lines 908-910):

token=(char *) RelinquishMagickMemory(token);
device_benchmark=(MagickCLDeviceBenchmark *) RelinquishMagickMemory(
  device_benchmark);  // BUG: members (platform_name, vendor_name, name, version) not freed!

Correct cleanup (only executed when /> is found, lines 840-849):

device_benchmark->platform_name=(char *) RelinquishMagickMemory(device_benchmark->platform_name);
device_benchmark->vendor_name=(char *) RelinquishMagickMemory(device_benchmark->vendor_name);
device_benchmark->name=(char *) RelinquishMagickMemory(device_benchmark->name);
device_benchmark->version=(char *) RelinquishMagickMemory(device_benchmark->version);
device_benchmark=(MagickCLDeviceBenchmark *) RelinquishMagickMemory(device_benchmark);

PoC

Environment:

• OS: Ubuntu 22.04.5 LTS (Linux 6.8.0-87-generic x86_64)
• Compiler: GCC 11.4.0
• ImageMagick: 7.1.2-13 (commit a52c1b402be08ef8ae193f28ac5b2e120f2fa26f)

Step 1: Build ImageMagick with AddressSanitizer

cd ImageMagick
./configure \
    CFLAGS="-g -O0 -fsanitize=address -fno-omit-frame-pointer" \
    CXXFLAGS="-g -O0 -fsanitize=address -fno-omit-frame-pointer" \
    LDFLAGS="-fsanitize=address" \
    --disable-openmp
make -j$(nproc)

Step 2: Create malformed XML file

Step 3: Place file in OpenCL cache directory

mkdir -p ~/.cache/ImageMagick
cp malformed_opencl_profile.xml ~/.cache/ImageMagick/ImagemagickOpenCLDeviceProfile.xml

Step 4: Run ImageMagick with leak detection

export ASAN_OPTIONS="detect_leaks=1:symbolize=1"
./utilities/magick -size 100x100 xc:red output.png

ASAN Output:

=================================================================
==2543490==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 96 byte(s) in 2 object(s) allocated from:
    #0 ... in AcquireMagickMemory MagickCore/memory.c:536
    #1 ... in LoadOpenCLDeviceBenchmark MagickCore/opencl.c:807

Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 ... in ConstantString MagickCore/string.c:692
    #1 ... in LoadOpenCLDeviceBenchmark MagickCore/opencl.c:878  ← name

Direct leak of 14 byte(s) in 1 object(s) allocated from:
    #0 ... in ConstantString MagickCore/string.c:692
    #1 ... in LoadOpenCLDeviceBenchmark MagickCore/opencl.c:885  ← platform_name

Direct leak of 14 byte(s) in 1 object(s) allocated from:
    #0 ... in ConstantString MagickCore/string.c:692
    #1 ... in LoadOpenCLDeviceBenchmark MagickCore/opencl.c:898  ← vendor_name

Direct leak of 15 byte(s) in 1 object(s) allocated from:
    #0 ... in ConstantString MagickCore/string.c:692
    #1 ... in LoadOpenCLDeviceBenchmark MagickCore/opencl.c:900  ← version

SUMMARY: AddressSanitizer: 203 byte(s) leaked in 18 allocation(s).

Impact

Vulnerability Type: CWE-401…

ImageMagick before 7.1.2-13 contains a memory leak vulnerability in LoadOpenCLDeviceBenchmark() function when parsing malformed OpenCL device profile XML files with unclosed device elements. Attackers with write access to the OpenCL cache directory can place malicious XML files to exhaust memory and cause denial of service.

ImageMagick before 7.1.2-13 contains a memory leak vulnerability in LoadOpenCLDeviceBenchmark() function when parsing malformed OpenCL device profile XML files with unclosed device elements. Attackers with write access to the OpenCL cache directory can place malicious XML files to exhaust memory and cause denial of service.

These are all security issues fixed in the ImageMagick-7.1.2.27-1.1 package on the GA media of openSUSE Tumbleweed.

This update for ImageMagick fixes the following issues

• CVE-2026-53466: integer overflow in the XCF decoder can result in an out-of-bounds read when a crafted image is read (bsc#1270073).
• CVE-2026-53467: allocated memory left unchanged in the MNG decoder can lead to a heap information disclosure (bsc#1270074).
• CVE-2026-55594: missing depth check in the MVG decoder will result in a stack overflow when a crafted image is provided (bsc#1270077).
• CVE-2026-55595: providing invalid arguments to the connected-components option can lead to an infinite loop (bsc#1270079).
• CVE-2026-55597: incorrect handling of arguments can cause a heap buffer over-write in the JP2 encoder (bsc#1270080).
• CVE-2026-56361: off-by-one error in morphology validation can lead to an out-of-bounds read (bsc#1270001).
• CVE-2026-56363: integer overflow leading to a division by zero in binomial kernel processing can cause an application crash (bsc#1270002).
• CVE-2026-56364: memory leak in LoadOpenCLDeviceBenchmark function when parsing malformed OpenCL device profile XML files with unclosed device elements (bsc#1270003).
• CVE-2026-56374: missing boundary checks can lead to a heap buffer overflow in the FTXT encoder when parsing ftxt:format (bsc#1271099).
• CVE-2026-56379: arbitrary MVG drawing command injection via the SVG decoder when processing specially crafted SVG files (bsc#1268878).
• GHSA-3j4x-rwrx-xxj9: possible use-after-free write in PDB decoder (bsc#1268640).

This update for ImageMagick fixes the following issues

• CVE-2026-53466: integer overflow in the XCF decoder can result in an out-of-bounds read when a crafted image is read (bsc#1270073).
• CVE-2026-53467: allocated memory left unchanged in the MNG decoder can lead to a heap information disclosure (bsc#1270074).
• CVE-2026-55594: missing depth check in the MVG decoder will result in a stack overflow when a crafted image is provided (bsc#1270077).
• CVE-2026-55595: providing invalid arguments to the connected-components option can lead to an infinite loop (bsc#1270079).
• CVE-2026-55597: incorrect handling of arguments can cause a heap buffer over-write in the JP2 encoder (bsc#1270080).
• CVE-2026-56361: off-by-one error in morphology validation can lead to an out-of-bounds read (bsc#1270001).
• CVE-2026-56363: integer overflow leading to a division by zero in binomial kernel processing can cause an application crash (bsc#1270002).
• CVE-2026-56364: memory leak in LoadOpenCLDeviceBenchmark function when parsing malformed OpenCL device profile XML files with unclosed device elements (bsc#1270003).
• CVE-2026-56374: missing boundary checks can lead to a heap buffer overflow in the FTXT encoder when parsing ftxt:format (bsc#1271099).
• CVE-2026-56379: arbitrary MVG drawing command injection via the SVG decoder when processing specially crafted SVG files (bsc#1268878).
• GHSA-3j4x-rwrx-xxj9: possible use-after-free write in PDB decoder (bsc#1268640).

This update for ImageMagick fixes the following issues:

• CVE-2026-53466: integer overflow in the XCF decoder can result in an out-of-bounds read when a crafted image is read (bsc#1270073).
• CVE-2026-53467: allocated memory left unchanged in the MNG decoder can lead to a heap information disclosure (bsc#1270074).
• CVE-2026-55594: missing depth check in the MVG decoder will result in a stack overflow when a crafted image is provided (bsc#1270077).
• CVE-2026-55595: providing invalid arguments to the connected-components option can lead to an infinite loop (bsc#1270079).
• CVE-2026-55597: incorrect handling of arguments can cause a heap buffer over-write in the JP2 encoder (bsc#1270080).
• CVE-2026-56361: off-by-one error in morphology validation can lead to an out-of-bounds read (bsc#1270001).
• CVE-2026-56363: integer overflow leading to a division by zero in binomial kernel processing can cause an application crash (bsc#1270002).
• CVE-2026-56364: memory leak in LoadOpenCLDeviceBenchmark function when parsing malformed OpenCL device profile XML files with unclosed device elements (bsc#1270003).
• CVE-2026-56374: missing boundary checks can lead to a heap buffer overflow in the FTXT encoder when parsing ftxt:format (bsc#1271099).
• CVE-2026-56379: arbitrary MVG drawing command injection via the SVG decoder when processing specially crafted SVG files (bsc#1268878).
• CVE-2026-42050: stack buffer overflow via a malicious MIFF file (bsc#1265048).
• CVE-2026-42326: out-of-bounds read of single byte via malicious IPTC file (bsc#1268092).
• CVE-2026-45031: missing check in the PSD decoder allows bypass of the list-length resource policy when decoding a PSD image (bsc#1268094).
• CVE-2026-45358: off-by-one error in the meta encoder can lead to an out-of-bounds read of a single byte (bsc#1268102).
• CVE-2026-45359: heap buffer overread via invalid connected-components value (bsc#1268095).
• CVE-2026-45624: performing a polynomial distortion can lead to an out-of-bounds over-read of 24 bytes (bsc#1268096).
• CVE-2026-45664: missing check in the MNG coder can lead to excessive resource use and a DoS (bsc#1268101).
• CVE-2026-46520: out-of-bounds write when processing multiple images with different dimensions (bsc#1268112).
• CVE-2026-46521: missing check when using LZMA compression in the MIFF encoder can lead to an out-of-bounds write (bsc#1268124).
• CVE-2026-46522: missing check in the MIFF decoder can lead to a denial of service via crafted MIFF file (bsc#1268126).
• CVE-2026-46523: heap use-after-free via a crafted MSL image (bsc#1268125).
• CVE-2026-46557: missing depth check can lead to a stack buffer overflow in the fx operation when processing a crafted argument (bsc#1268123).
• CVE-2026-46559: incorrect check in the JP2 can lead to a heap buffer overwrite of a single byte when specifying certain options (bsc#1268121).
• CVE-2026-46692: heap buffer overwrite in the server process via an attacker who can connect to a magick -distribute- cache service (bsc#1268120).
• CVE-2026-46693: file descriptor hijacking in the server process when a race condition is met via an attacker who can connect to a magick -distribute-cache service (bsc#1268117).
• CVE-2026-47165: distributed pixel cache was designed to operate without a challenge-response authentication model (bsc#1268114).
• CVE-2026-47166: heap buffer overread in the server process via an attacker who can connect to a magick -distribute- cache service (bsc#1268113).
• CVE-2026-48724: heap buffer underwrite in the Floyd-Steinberg depth dithering (bsc#1268116).
• CVE-2026-48734: missing depth or visited-set check can lead to a stack buffer overflow in the MVG decoder (bsc#1268122).
• CVE-2026-48994: missing check of a return value in the MAT decoder can lead to a heap buffer overwrite on 32-bit systems (bsc#1268111).
• CVE-2026-49218: missing check in the DCM decoder can lead to a DoS (bsc#1268110).
• CVE-2026-53460: missing check…

This update for ImageMagick fixes the following issues

• CVE-2026-42050: stack buffer overflow in XTileImage (bsc#1265048).
• CVE-2026-42326: information disclosure via malicious IPTC input file (bsc#1268092).
• CVE-2026-45031: denial of Service due to resource policy bypass in PSD decoder (bsc#1268094).
• CVE-2026-45358: off by one in the meta encoder could result in an out of bounds read of a single byte in the meta encoder (bsc#1268102).
• CVE-2026-45359: information Disclosure via Invalid Connected-Components Value (bsc#1268095).
• CVE-2026-45624: data exposure due to image processing vulnerability (bsc#1268096).
• CVE-2026-45664: denial of Service due to excessive resource use in MNG coder (bsc#1268101).
• CVE-2026-46520: denial of Service via out-of-bounds write when processing multiple images (bsc#1268112).
• CVE-2026-46521: out of bounds write can occur due to a missing check when using LZMA compression in the MIFF encoder (bsc#1268124).
• CVE-2026-46522: denial of service via crafted MIFF file due to a missing check in the MIFF decoder (bsc#1268126).
• CVE-2026-46523: heap-use-after-free via a crafted MSL image (bsc#1268125).
• CVE-2026-46557: stack overflow can occur in the fx operation by passing a crafted argument due to a missing depth check (bsc#1268123).
• CVE-2026-46559: heap buffer over-write of a single byte when specifying certain options due to n incorrect check in the JP2 (bsc#1268121).
• CVE-2026-46692: heap buffer over-write in the server process via an attacker who can connect to a magick -distribute- cache service (bsc#1268120).
• CVE-2026-46693: file descriptor hijacking in the server process when a race condition is met via an attacker who can connect to a magick -distribute-cache service (bsc#1268117).
• CVE-2026-47165: distributed pixel cache was originally designed to operate without a challenge--response authentication model (bsc#1268114).
• CVE-2026-47166: heap buffer over-read in the server process via an attacker who can connect to a magick -distribute- cache service (bsc#1268113).
• CVE-2026-48734: Stack Overflow in MVG decoder (bsc#1268122).
• CVE-2026-48994: heap buffer over-write due to a missing check of a return value in the MAT decoder on 32-bit systems (bsc#1268111).
• CVE-2026-49218: denial of service due to a missing check in the DCM decoder (bsc#1268110).
• CVE-2026-53460: out-of-Memory condition due to a missing check for maximum memory request in AcquireAlignedMemory (bsc#1268108).
• CVE-2026-53461: out of bounds heap write due to an incorrect loop in the ICON decoder (bsc#1268107).
• CVE-2026-53463: null pointer deference due to passing incorrect arguments in the distort operation (bsc#1268105).
• CVE-2026-53464: small memory leak due to providing invalid options to the wand option parser (bsc#1268103).
• CVE-2026-53466: heap Buffer Over-Read in XCF decoder due to integer conversion overflow (bsc#1270073).
• CVE-2026-53467: information Disclosure in MNG decoder because allocated memory is left unchanged (bsc#1270074).
• CVE-2026-55594: stack Overflow in MVG decoder due to missing depth check (bsc#1270077).
• CVE-2026-55595: infinite Loop in connected-components when providing invalid arguments (bsc#1270079).
• CVE-2026-55597: heap Buffer Over-Write in JP2 encoder when due to incorrect handling of arguments (bsc#1270080).
• CVE-2026-56361: off-by-one origin validation in allows out-of-bounds read in morphology processing (bsc#1270001).
• CVE-2026-56363: division by Zero in binomial kernel (bsc#1270002).
• CVE-2026-56364: memory Leak in LoadOpenCLDeviceBenchmark() when parsing malformed XML (bsc#1270003).
• CVE-2026-56365: memory leak in PNG encoder when writing a MNG image (bsc#1270004).
• CVE-2026-56367: integer overflow in the PSB (PSD v2) RLE decoding path that causes a heap out-of-bounds read (bsc#1268645).
• CVE-2026-56368: memory leak in multiple coders that write raw pixel data (bsc#1269064).
• CVE-2026-56370: out-of-bounds access in…

This update for ImageMagick fixes the following issues

• CVE-2026-53466: integer overflow in the XCF decoder can result in an out-of-bounds read when a crafted image is read (bsc#1270073).
• CVE-2026-53467: allocated memory left unchanged in the MNG decoder can lead to a heap information disclosure (bsc#1270074).
• CVE-2026-55594: missing depth check in the MVG decoder will result in a stack overflow when a crafted image is provided (bsc#1270077).
• CVE-2026-55595: providing invalid arguments to the connected-components option can lead to an infinite loop (bsc#1270079).
• CVE-2026-55597: incorrect handling of arguments can cause a heap buffer over-write in the JP2 encoder (bsc#1270080).
• CVE-2026-56361: off-by-one error in morphology validation can lead to an out-of-bounds read (bsc#1270001).
• CVE-2026-56363: integer overflow leading to a division by zero in binomial kernel processing can cause an application crash (bsc#1270002).
• CVE-2026-56364: memory leak in LoadOpenCLDeviceBenchmark function when parsing malformed OpenCL device profile XML files with unclosed device elements (bsc#1270003).
• CVE-2026-56365: memory leak in PNG encoder when writing a MNG image (bsc#1270004).
• CVE-2026-56367: integer overflow in the PSB (PSD v2) RLE decoding path can lead to an heap out-of-bounds read (bsc#1268645).
• CVE-2026-56368: improper memory management can lead to memory leak in multiple coders that write raw pixel data (bsc#1269064).
• CVE-2026-56370: out-of-bounds access in ConnectedComponentsImage() when processing connected-components:* artifacts with invalid indices (bsc#1269063).
• CVE-2026-56371: memory leak in coders/txt.c when processing TXT files with texture attributes (bsc#1268879).
• CVE-2026-56376: heap use-after-free in the meta coder can lead to denial of service via specially crafted image files (bsc#1268880).
• CVE-2026-56379: arbitrary MVG drawing command injection via the SVG decoder when processing specially crafted SVG files (bsc#1268878).
• GHSA-3j4x-rwrx-xxj9: possible use-after-free write in PDB decoder (bsc#1268640).