high7.5
CVE-2026-106115
ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
Impact
ImageSharp is a 2D graphics library. From 2.1.0 until 4.1.2, the TIFF CCITT Group 4 encoder allocates Width times rowsPerStrip bytes even though T6BitCompressor.CompressStrip can emit encoded row data and two 12-bit end-of-facsimile-block codes beyond that capacity. TiffCcittCompressor.WriteCode performs unchecked writes, and a decode-and-re-encode flow can inherit TiffCompression.CcittGroup4Fax and one-bit metadata from attacker-supplied input. The resulting out-of-bounds writes can corrupt memory and terminate the process. This issue is fixed in version 4.1.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | SixLabors.ImageSharp | >= 2.1.0, < 3.2.0 | 3.2.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sixlabors | Imagesharp | from 2.1.0 before 3.2.0 from 4.0.0 before 4.1.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jjfr-hcj7-qf5w
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jjfr-hcj7-qf5w
- https://nvd.nist.gov/vuln/detail/CVE-2026-106115
- https://github.com/SixLabors/ImageSharp/pull/3187
- https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2
- https://github.com/SixLabors/ImageSharp/pull/3208
- https://github.com/SixLabors/ImageSharp/commit/baa37cd19077b2a2a0c5667535111cf31d48c019
- https://github.com/SixLabors/ImageSharp/releases/tag/v3.2.0