CVE-2026-106115
ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | sixlabors |
| Product | imagesharp |
| Published | Oct 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
SixLabors / ImageSharp
>= 2.1.0, < 4.1.2
References
github.com: https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-jjfr-hcj7-qf5w github.com: https://github.com/SixLabors/ImageSharp/pull/3187 github.com: https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95 github.com: https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2