What’s Vulnerable › Vulnerabilities

CVE-2026-106110: ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-06 · updated 2026-10-24
• Weakness: CWE-787

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 products

• SixLabors ImageSharp: from 2.0.0 before 3.2.0; from 4.0.0 before 4.1.2 — fixed in 3.2.0, 4.1.2

How to fix

Upgrade to a fixed version: SixLabors ImageSharp 3.2.0, 4.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/SixLabors/ImageSharp/commit/a9498c6db3642ef92c712ebc81e706914ac16a95
• https://github.com/SixLabors/ImageSharp/pull/3187
• https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2
• https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-j9gm-c75j-xc9q
• https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-j9gm-c75j-xc9q

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