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CVE-2026-106116— ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop

Quick assessment

Affected
SixLabors ImageSharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ImageSharp 是一个 2D 图形库。在版本 2.0.0 至 4.1.2 之间， 会信任 BigTIFF 中 IFD（图像文件目录）条目的 64 位计数，并针对每个声明的条目进行一次迭代。当剩余字节少于 20 字节时， 将直接返回，既不推进数据流，也不终止外层循环。因此，一个小型的构造异常（malformed）BigTIFF 文件可使单个解码线程在攻击者控制的持续时间内持续执行。本报告不主张该问题会导致工作线程池耗尽。此问题已在 4.1.2 版本中修复。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
SixLabors ImageSharp >= 2.0.0, < 4.1.2 affected
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I. Basic Information for CVE-2026-106116

Vulnerability Information
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Vulnerability Title
ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop
Source: CVE Program / CVE List V5
Vulnerability Description
ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, ExifReader.ReadValues64 trusts the 64-bit BigTIFF IFD entry count and iterates once per declared entry. When fewer than 20 bytes remain, ExifReader.ReadValue64 returns without advancing the stream or terminating the outer loop, so a small malformed BigTIFF can keep one decoder thread executing for an attacker-controlled duration. This report does not claim worker-pool exhaustion. This issue is fixed in version 4.1.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SixLabors ImageSharp >= 2.0.0, < 4.1.2 -

II. Public POCs for CVE-2026-106116

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III. Intelligence Information for CVE-2026-106116

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Other References for CVE-2026-106116 (4)

Same Patch Batch · SixLabors · 2026-10-06 · 9 CVEs total

CVE-2026-106110 7.5 HIGH ImageSharp: TIFF CCITT T4 encoder can write past its compressed output buffer
CVE-2026-106115 7.5 HIGH ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output buffer
CVE-2026-106112 7.5 HIGH ImageSharp: ICC LUT16 output channel count can write beyond Vector4
CVE-2026-106113 7.5 HIGH ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram
CVE-2026-106117 7.5 HIGH ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows s
CVE-2026-106118 7.5 HIGH ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes sca
CVE-2026-106111 5.9 MEDIUM ImageSharp: EXR ZIP decoder can expose stale allocator data after a short inflate
CVE-2026-106114 5.3 MEDIUM ImageSharp: ICC CLUT parsing allocates from unvalidated channel and grid dimensions

IV. Related Vulnerabilities

Same product: ImageSharp
Same vendor: SixLabors
Same weakness: CWE-835

V. Comments for CVE-2026-106116

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