CVE-2026-77118 Affecting GraphicsMagick-doc package, versions <0:1.3.45-1.amzn2023.0.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-GRAPHICSMAGICKDOC-19811087
- published15 Sept 2026
- disclosed20 Aug 2026
Introduced: 20 Aug 2026
CVE-2026-77118 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 GraphicsMagick-doc to version 0:1.3.45-1.amzn2023.0.3 or higher.
This issue was patched in ALAS2023-2026-1960.
NVD Description
Note: Versions mentioned in the description apply only to the upstream GraphicsMagick-doc package and not the GraphicsMagick-doc package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
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.