python-pillow Pillow up to 12.3.0 TIFF Image TiffImagePlugin.py TiffImagePlugin._save exif/tiffinfo heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in python-pillow Pillow up to 12.3.0. Affected is the function TiffImagePlugin._save of the file TiffImagePlugin.py of the component TIFF Image Handler. The manipulation of the argument exif/tiffinfo results in heap-based overflow. This vulnerability was named CVE-2026-128067. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in python-pillow Pillow up to 12.3.0. It has been classified as critical. Affected is the function TiffImagePlugin._save of the file TiffImagePlugin.py of the component TIFF Image Handler. The manipulation of the argument exif/tiffinfo with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. The product writes past the end of a buffer that was allocated on the heap. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Pillow is a Python imaging library. From 2.3.0 through 12.3.0, Pillow applications that save compressed TIFF images through libtiff can pass attacker-controlled image geometry tags to the encoder while allocating its row buffer from the actual image dimensions. The affected TiffImagePlugin._save path allows ImageWidth, ImageLength, or SamplesPerPixel from exif=, tiffinfo=, or a source TIFF IFD to make libtiff consume a larger scanline than the buffer supplied by ImagingLibTiffEncode. This can read heap memory into the generated TIFF or crash the process. When TIFF Predictor 2 is enabled, libtiff can rewrite the oversized scanline in place and corrupt memory beyond the buffer. A carried-over PlanarConfiguration value of 2 instead makes libtiff use a shorter scanline and can produce an undecodable output file, but is not established to cause the out-of-bounds access. This issue is fixed in version 13.0.0.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-128067 since 11/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 13.0.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Programming Language Software

Vendor

• python-pillow

Name

• Pillow

Version

• 12.0
• 12.1
• 12.2
• 12.3.0

License

• open-source

Website

• Product: https://github.com/python-pillow/Pillow/

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