OESA-2026-3656

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OESA-2026-3656

Summary: GraphicsMagick security update

Details: GraphicsMagick is a comprehensive image processing package which is initially based on ImageMagick 5.5.2, but which has undergone significant re-work by the GraphicsMagick Group to significantly improve the quality and performance of the software. Security Fix(es): 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.(CVE-2026-77118)

References: https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3656, https://nvd.nist.gov/vuln/detail/CVE-2026-77118