CVE-2026-106118 · GHSA-v76p-62qx-wwq2

ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

Risk score: 65/100
CVSS: 7.5 v3.1
Exploit chance (30 days): 0.6%
Published: 6 Oct 2026

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What to know

What it is: ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, tiled TIFF decoding allocates a destination buffer using TileWidth but TiffDecompressorsFactory.Create constructs T4, T6, and Modified Huffman decompressors using the full frame width. TiffDecoderCore.DecodeTilesChunky can therefore direct frame-width fax sc…
Affected: ImageSharp (nuget) >= 3.0.0, < 4.1.1
Fix: Upgrade ImageSharp to 4.1.1 or later.
Exploitation: No known exploitation

Why it is Amber

CVSS 7.5 high
Remotely exploitable without logging in
On your watchlist: NuGet

Affected packages

Package	Ecosystem	Vulnerable	Fixed in
ImageSharp	nuget	>= 3.0.0, < 4.1.1	4.1.1

References

Original description

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, tiled TIFF decoding allocates a destination buffer using TileWidth but TiffDecompressorsFactory.Create constructs T4, T6, and Modified Huffman decompressors using the full frame width. TiffDecoderCore.DecodeTilesChunky can therefore direct frame-width fax scanlines into a tile-width buffer when TileWidth is smaller than ImageWidth. The mismatch causes attacker-controlled out-of-bounds writes, heap corruption, and process termination even with legal per-row run codes. This tiled-path vulnerability is distinct from oversized CCITT runs in strip decoding. This issue is fixed in version 4.1.1.

Last activity 6 Oct 2026. Patch Forecast updates every hour.