Answer in brief
CVE-2026-77118 records a High severity (CVSS 8.4) vulnerability in Out-of-bounds write in GraphicsMagick PCD decoder. The current sources do not mark it as known exploited. The current feed maps Debian/graphicsmagick (generic), GraphicsMagick Group/GraphicsMagick (generic), Fedora Project/GraphicsMagick (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Debian/graphicsmagick (generic), GraphicsMagick Group/GraphicsMagick (generic), Fedora Project/GraphicsMagick (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Debian/graphicsmagickgeneric | >=0 <1.4+really1.3.48-1 | 1.4+really1.3.48-1 |
| GraphicsMagick Group/GraphicsMagickgeneric | >=1.0.0 <1.3.48 | 1.3.48 |
| Fedora Project/GraphicsMagickgeneric | >=0 <1.3.48 | 1.3.48 |
Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 20, 2026
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.
Quoted source text, attributed separately from HOL analysis.