ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106115
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 18:16:53 UTC
Updated2026-10-06 20:03:40 UTC
DescriptionImageSharp 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SixLabors ImageSharp affected >= 2.1.0, < 4.1.2 Not specified

References

ReferenceSourceLinkTags
github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914... [email protected] github.com
github.com/SixLabors/ImageSharp/pull/3187 [email protected] github.com
github.com/SixLabors/ImageSharp/releases/tag/v4.1.2 [email protected] github.com
github.com/SixLabors/ImageSharp/security/advisories/GHSA-jjfr-hcj7-qf5w [email protected] github.com
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