CVE-2026-106117: high-severity vulnerability in SixLabors ImageSharp
ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
exploitation probability
0.4%top 65% of all CVEs
observed exploitation
nono source reports it
ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized makeup-code runs, and ModifiedHuffmanTiffCompression.Decompress validates the width only after writing. The unchecked writes can overflow the strip buffer, corrupt heap memory, and terminate the process. This strip-path vulnerability is distinct from the tiled decompressor-width mismatch. This issue is fixed in version 4.1.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
SixLabors · ImageSharpRelated CVEs — SixLabors ImageSharp
In the same product, most dangerous first.
CVE-2024-41132MEDIUMSixLabors ImageSharp Allows Excessive Memory Allocation in Gif DecoderEPSS 0.8%CVE-2024-41131HIGHOut-of-bounds Write in SixLabors ImageSharpEPSS 0.7%CVE-2024-32035MEDIUMMemory Allocation with Excessive Size Value in SixLabors.ImageSharpEPSS 0.6%CVE-2026-106118HIGHImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB writeEPSS 0.6%CVE-2024-32036MEDIUMSixLabors.ImageSharp vulnerable to data leakageEPSS 0.6%CVE-2025-27598HIGHOut-of-bounds Write in SixLabors ImageSharpEPSS 0.6%