Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-106110ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer
High 7.5
In plain English
A high-severity out-of-bounds write in ImageSharp from SixLabors. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| NuGet | sixlabors.imagesharp | 3.2.0 | GHSA-j9gm-c75j-xc9q |
| NuGet | sixlabors.imagesharp | 4.1.2 | GHSA-j9gm-c75j-xc9q |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SixLabors | ImageSharp | >= 2.0.0, < 4.1.2 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-j9gm-c75j-xc9q x_refsource_CONFIRM
- https://github.com/SixLabors/ImageSharp/pull/3187 x_refsource_MISC
- https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95 x_refsource_MISC
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2 x_refsource_MISC