CVE-2026-55467

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the cupsdCreateJob option-string builder in scheduler/job.c maps attacker-controlled destination-uri and pre-dial-string values from a configured fax queue to the phone and...

faxhell

faxhell "Fax Shell" A Proof-of-Concept bind shell using the Fax service and a DLL hijack based on Ualapi.dll. See our writeup at: https://windows-internals.com/faxing-your-way-to-system/ How to use Build Ualapi.dll and place in c:\windows\system32 Start the Fax service, which will load the DLL an...

CVE-2026-87707

Heap-based buffer overflow in Windows Fax and Scan Service allows an authorized attacker to elevate privileges locally...

CVE-2026-87707

A heap-based buffer overflow in the Windows Fax and Scan Service allows an authorized attacker to achieve local privilege escalation . The vulnerability has a high CVSS 3.1 base score of 7.8 . Official remediation is available through a Microsoft fix .

Windows Fax and Scan Service Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Fax and Scan Service allows an authorized attacker to elevate privileges locally...

Microsoft Windows: CVE-2026-87707: Windows Fax and Scan Service Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Fax and Scan Service allows an authorized attacker to elevate privileges locally...

faxhell

faxhell "Fax Shell" Un shell de enlace de prueba de concepto que utiliza el servicio Fax y un secuestro de DLL basado en Ualapi.dll. Consulte nuestro análisis en: https://windows-internals.com/faxing-your-way-to-system/ Cómo usar Compila Ualapi.dll y colócalo en c:\windows\system32 Inicia el...

NoFaxGiven

NoFaxGiven - Code Execution & Persistence in NETWORK SERVICE FAX Service A fax routing extension is a DLL that adds routing functionality to the fax service. Multiple fax routing extensions can reside on one server. When the fax server receives a fax transmission, it routes the received document...

CVE-2023-37598

CVE-2023-37598 — issabel-pbx 4.0.0-6: Cross-Site Request Forgery CSRF Overview CVE ID: CVE-2023-37598 Vulnerability Type: Cross-Site Request Forgery CSRF Affected Product: issabel-pbx v4.0.0-6 Severity: Medium Discovered by: Sahil Ojha Disclosure Date: 10/07/2023 Vendor Homepage:...

GHSA-V76P-62QX-WWQ2 ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

Summary When decoding a tiled TIFF with fax compression T4/T6/MH, DecodeTilesChunky allocates each tile buffer from TileWidth ceilTileWidthbpp/8TileLength bytes but constructs the fax decompressor with frame.Width: TiffDecompressorsFactory ignores the isTiled/tileWidth/tileHeight parameters...

ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

Summary When decoding a tiled TIFF with fax compression T4/T6/MH, DecodeTilesChunky allocates each tile buffer from TileWidth ceilTileWidthbpp/8TileLength bytes but constructs the fax decompressor with frame.Width: TiffDecompressorsFactory ignores the isTiled/tileWidth/tileHeight parameters...

ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp

Summary When decoding a fax-compressed strip TIFF Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman, the CCITT decompressors write decoded runs through BitWriterUtils.WriteBits/WriteBit/WriteZeroBit, which advance and write bits via Unsafe.Add with read-modify-write semantics —...

GHSA-JJ3Q-CWQJ-842R ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp

Summary When decoding a fax-compressed strip TIFF Compression=3 / Group 3 1D, or Compression=2 / Modified Huffman, the CCITT decompressors write decoded runs through BitWriterUtils.WriteBits/WriteBit/WriteZeroBit, which advance and write bits via Unsafe.Add with read-modify-write semantics —...

CVE-2026-106118 ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, tiled TIFF decoding allocates a destination buffer using TileWidth but TiffDecompressorsFactory.Create constructs T4, T6, and Modified Huffman decompressors using the full frame width. TiffDecoderCore.DecodeTilesChunky can therefore...

CVE-2026-106117 ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized...

CVE-2026-106117 ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized...

CVE-2026-106117

The SixLabors.ImageSharp 2D graphics library (versions 3.0.0 through 4.1.1 ) is vulnerable to a heap out-of-bounds (OOB) write during the decoding of strip TIFF images using CCITT Group 3 or Modified Huffman compression. The root cause is that T4TiffCompression.WritePixelRun can accumulate oversi...

CVE-2026-106117 ImageSharp: CCITT fax decompression (T4/Modified Huffman): unbounded WriteBits overflows strip buffer — heap OOB write in SixLabors.ImageSharp

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, decoding a strip TIFF using CCITT Group 3 or Modified Huffman compression can pass attacker-expanded runs to BitWriterUtils.WriteBits without first checking the current row width. T4TiffCompression.WritePixelRun can accumulate oversized...

PaperCut NG < 25.0.13 / 26.x < 26.0.5 Multiple Vulnerabilities

The version of PaperCut NG installed on the remote Windows host is prior to 25.0.13, or 26.x prior to 26.0.5. It is, therefore, affected by the following vulnerabilities: - An improper limitation of a pathname to a restricted directory path traversal vulnerability in the Scan-to-Fax component of...

PaperCut MF < 25.0.13 / 26.x < 26.0.5 Multiple Vulnerabilities

The version of PaperCut MF installed on the remote Windows host is prior to 25.0.13, or 26.x prior to 26.0.5. It is, therefore, affected by the following vulnerabilities: - An improper limitation of a pathname to a restricted directory path traversal vulnerability in the Scan-to-Fax component of...