CVE-2026-77118
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
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.
Risk Assessment
Processing an untrusted PCD file can lead to memory corruption, which may result in application crash, arbitrary code execution, or data integrity compromise.
Recommendation
It is recommended to upgrade GraphicsMagick to the latest version containing the fix. Also, avoid processing untrusted PCD files and restrict access to applications using this library.
Other vulnerabilities in GraphicsMagick
See all- CVE-2017-17912High
In GraphicsMagick 1.4 snapshot-20171217 Q8, there is a heap-based buffer over-read in ReadNewsProfile in coders/tiff.c, in which LocaleNCompare reads heap data beyond the allocated region.
- CVE-2017-17783High
In GraphicsMagick 1.3.27a, there is a buffer over-read in ReadPALMImage in coders/palm.c when QuantumDepth is 8.
- CVE-2017-17782High
In GraphicsMagick 1.3.27a, there is a heap-based buffer over-read in ReadOneJNGImage in coders/png.c, related to oFFs chunk allocation.
- CVE-2017-17503High
GraphicsMagick 1.3.26 has a vulnerability in the ReadGRAYImage function in coders/gray.c that allows for a heap-based buffer over-read via a crafted file.
- CVE-2017-17502High
GraphicsMagick 1.3.26 has a vulnerability in the ReadCMYKImage function in coders/cmyk.c that allows for a heap-based buffer over-read via a crafted file.
- CVE-2017-17501High
GraphicsMagick 1.3.26 has a heap-based buffer over-read vulnerability in the WriteOnePNGImage function in coders/png.c, which can be exploited via a crafted file.
- CVE-2017-17500High
GraphicsMagick 1.3.26 has a vulnerability in the ReadRGBImage function in coders/rgb.c that allows for a heap-based buffer over-read via a crafted file.
- CVE-2017-17498High
The WritePNMImage function in coders/pnm.c in GraphicsMagick 1.3.26 has a vulnerability that allows remote attackers to cause a denial of service through a heap-based buffer overflow, leading to application crashes.
- CVE-2017-16669High
GraphicsMagick 1.3.26 has a vulnerability that allows remote attackers to cause a denial of service through a heap-based buffer overflow in coders/wpg.c, leading to application crash. This issue is related to the AcquireCacheNexus function in magick/pixel_cache.c.
- CVE-2017-16547High
The DrawImage function in GraphicsMagick 1.3.26 does not properly handle pop keywords associated with push keywords, potentially leading to application crashes or denial of service.
Original NVD description (English source)
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.