CVE-2026-77118: GraphicsMagick Group GraphicsMagick, грешка в паметта

Описание

Оригинално описание

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.

Засегнати продукти

• GraphicsMagick Group GraphicsMagick: 1.0.0 преди 1.3.48
• Debian graphicsmagick: преди 1.4+really1.3.48-1
• Fedora Project GraphicsMagick: преди 1.3.48

Вид слабост

• CWE-787 Out-of-bounds Write

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-77118
• https://nvd.nist.gov/vuln/detail/CVE-2026-77118
• https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/commit/937cdd9920bd96
• https://foss.heptapod.net/graphicsmagick/graphicsmagick/-/raw/GraphicsMagick-1_3_48/ChangeLog