CVE-2026-106110 ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer
An attacker can cause memory corruption and process termination in ImageSharp by triggering a buffer overflow in the TIFF CCITT T4 encoder.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106110?
CVE-2026-106110 is a high-severity memory corruption vulnerability in SixLabors ImageSharp, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, the TIFF CCITT Group 3 encoder allocates an undersized compressed-data buffer for narrow 1-bit images. TiffCcittCompressor.Initialize does not reserve enough space for the row data and T4 end-of-line codes, and T4BitCompressor.CompressStrip reaches unchecked writes when TiffCompression.CcittGroup3Fax is selected directly or inherited from decoded TIFF metadata. An attacker-controlled encode or decode-and-re-encode flow can write beyond the logical output span, corrupt process memory, and terminate the process. This issue is fixed in version 4.1.2.
Weakness: CWE-787
Which versions are affected by CVE-2026-106110?
4 open source packages ship an affected version, including SixLabors.ImageSharp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
SixLabors.ImageSharp NuGet | From 2.0.0 | 3.2.0 |
SixLabors.ImageSharp NuGet | From 2.0.0 | 3.2.0 |
SixLabors.ImageSharp NuGet | From 4.0.0 | 4.1.2 |
SixLabors.ImageSharp NuGet | From 4.0.0 | 4.1.2 |
Products include Sixlabors Imagesharp.
How do I fix CVE-2026-106110?
Upgrade SixLabors.ImageSharp to a fixed version for your release line: 3.2.0 or 4.1.2.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-106110 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-106110 exists.
Other vulnerabilities in SixLabors ImageSharp
- CVE-2026-106112 ImageSharp: ICC LUT16 output channel count can write beyond Vector4
- CVE-2026-106113 ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram index
- CVE-2026-106115 ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
- CVE-2026-106117 ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp
- CVE-2025-27598 Out-of-bounds Write in SixLabors ImageSharp
Sources
Also known as ECHO-7a33-eca5-f033, GHSA-j9gm-c75j-xc9q.