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CVE-2026-106118— ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

Quick assessment

Affected
SixLabors ImageSharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ImageSharp 是一个 2D 图形库。在版本 3.0.0 至 4.1.1 期间，平铺 TIFF 解码过程会基于 TileWidth（瓦片宽度）分配目标缓冲区，而 TiffDecompressorsFactory.Create 方法在构建 T4、T6 和 Modified Huffman 解压器时，却使用的是完整图像帧的宽度（ImageWidth）。因此，当 TileWidth 小于 ImageWidth 时，TiffDecoderCore.DecodeTilesChunky 方法可能会将帧宽度的传真扫描线写入

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
SixLabors ImageSharp >= 3.0.0, < 4.1.1 affected
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I. Basic Information for CVE-2026-106118

Vulnerability Information
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Vulnerability Title
ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SixLabors ImageSharp >= 3.0.0, < 4.1.1 -

II. Public POCs for CVE-2026-106118

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III. Intelligence Information for CVE-2026-106118

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Other References for CVE-2026-106118 (4)

Same Patch Batch · SixLabors · 2026-10-06 · 9 CVEs total

CVE-2026-106110 7.5 HIGH ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer
CVE-2026-106115 7.5 HIGH ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
CVE-2026-106112 7.5 HIGH ImageSharp: ICC LUT16 output channel count can write beyond Vector4
CVE-2026-106113 7.5 HIGH ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram
CVE-2026-106117 7.5 HIGH ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows s
CVE-2026-106111 5.9 MEDIUM ImageSharp: EXR ZIP decoder can expose stale allocator data after a short inflate
CVE-2026-106114 5.3 MEDIUM ImageSharp: ICC CLUT parsing allocates from unvalidated channel and grid dimensions
CVE-2026-106116 5.3 MEDIUM ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop

IV. Related Vulnerabilities

Same product: ImageSharp
Same vendor: SixLabors
Same weakness: CWE-787

V. Comments for CVE-2026-106118

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