CVE-2026-106118: Sixlabors Imagesharp

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Sixlabors Imagesharp: from 3.0.0, before 4.1.1 (fixed in 4.1.1)

Published 2026-10-06. Last modified 2026-10-06.