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Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106115ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized 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.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 67.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 & fixed versions

EcosystemPackageFixed inAdvisory
NuGetsixlabors.imagesharp3.2.0GHSA-jjfr-hcj7-qf5w
NuGetsixlabors.imagesharp4.1.2GHSA-jjfr-hcj7-qf5w

Affected products (as reported)

VendorProductVersions
SixLabors ImageSharp >= 2.1.0, < 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