https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 08 Oct 2026 14:17:28 +0000 https://vulnerability.circl.lu/vuln/fkie_cve-2026-106115 <p>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.</p> <p>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.</p> https://vulnerability.circl.lu/vuln/fkie_cve-2026-106115 https://vulnerability.circl.lu/vuln/ghsa-jjfr-hcj7-qf5w <p><strong>Affected:</strong> NuGet: SixLabors.ImageSharp</p> <p>### Summary</p> <p>The TIFF CCITT Group 4 (T6) encoder writes beyond its logical compressed-data buffer when encoding a 1-bit image. A valid 1×1 Group 4 TIFF decoded and re-encoded with the default `TiffEncoder` terminates the process with an unhandled exception.</p> <p>### Affected package and versions</p> <p>- Package: `SixLabors.ImageSharp` (NuGet) - Affected range: `&gt;= 2.1.0, &lt;= 4.1.1` - Commit `0815358f9202a78bc7f3b83e19282dc3654b500f` corresponds to release **v4.1.1**.</p> <p>The T6 compressor was introduced by commit `3c9eb470a07a15012c2a29ad84090dcc804a7975`, first released in v2.1.0, with the same `Width * rowsPerStrip` allocation and unchecked code writes. The 1×1 exploit terminates published v2.1.0 and v4.1.1; its uncompressed control succeeds. Source history shows no capacity fix through v4.1.1. ### Details</p> <p>[`TiffCcittCompressor.Initialize`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compressors/TiffCcittCompressor.cs#L527-L532) allocates `Width * rowsPerStrip` bytes. A 1×1 strip therefore receives one byte.</p> <p>After encoding the row, [`T6BitCompressor.CompressStrip`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compressors/T6BitCompressor.cs#L53-L131) appends two 12-bit EOFB codes. [`WriteCode`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compre…</p> <p><strong>Affected:</strong> NuGet: SixLabors.ImageSharp</p> <p>### Summary</p> <p>The TIFF CCITT Group 4 (T6) encoder writes beyond its logical compressed-data buffer when encoding a 1-bit image. A valid 1×1 Group 4 TIFF decoded and re-encoded with the default `TiffEncoder` terminates the process with an unhandled exception.</p> <p>### Affected package and versions</p> <p>- Package: `SixLabors.ImageSharp` (NuGet) - Affected range: `&gt;= 2.1.0, &lt;= 4.1.1` - Commit `0815358f9202a78bc7f3b83e19282dc3654b500f` corresponds to release **v4.1.1**.</p> <p>The T6 compressor was introduced by commit `3c9eb470a07a15012c2a29ad84090dcc804a7975`, first released in v2.1.0, with the same `Width * rowsPerStrip` allocation and unchecked code writes. The 1×1 exploit terminates published v2.1.0 and v4.1.1; its uncompressed control succeeds. Source history shows no capacity fix through v4.1.1. ### Details</p> <p>[`TiffCcittCompressor.Initialize`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compressors/TiffCcittCompressor.cs#L527-L532) allocates `Width * rowsPerStrip` bytes. A 1×1 strip therefore receives one byte.</p> <p>After encoding the row, [`T6BitCompressor.CompressStrip`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compressors/T6BitCompressor.cs#L53-L131) appends two 12-bit EOFB codes. [`WriteCode`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Formats/Tiff/Compression/Compre…</p> https://vulnerability.circl.lu/vuln/ghsa-jjfr-hcj7-qf5w