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  4. CVE 2026 106116 imagesharp bigtiff ifd count can keep a decoder
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-106116

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

Answer in brief

CVE-2026-106116 records a Medium severity (CVSS 5.3) vulnerability in ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop. The current sources do not mark it as known exploited. The current feed maps SixLabors/ImageSharp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 6, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SixLabors/ImageSharp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SixLabors/ImageSharpgeneric>=2.0.0 <4.1.24.1.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SixLabors/ImageSharp.
  2. 2Review the reported fix. Update SixLabors/ImageSharp to 4.1.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ImageSharp: HistogramEqualization uses an unvalidated luminance as an unchecked histogram indexSame sixlabors/imagesharp package
  • ImageSharp: ICC CLUT parsing allocates from unvalidated channel and grid dimensionsSame sixlabors/imagesharp package
  • ImageSharp: TIFF CCITT T6 encoder writes beyond an undersized output bufferSame sixlabors/imagesharp package
  • ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharpSame sixlabors/imagesharp package
  • ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB writeSame sixlabors/imagesharp package
  • RabbitMQ: JSONReader in the default JSON-RPC mapper never terminates on truncated input, causing DoSAlso CWE-835

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-835
Source
CVE List V5
Source checked
Oct 6, 2026
References
4 linked sources
Open source record