# CVE-2026-128067: Pillow: Heap buffer overflow saving TIFF with libtiff when tags override image size

Status: published. Published: 2026-11-12. Updated: 2026-11-12.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- python-pillow / Pillow: >= 2.3.0, < 13.0.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 8.4 (high); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/python-pillow/Pillow/security/advisories/GHSA-xcvg-w56q-r89m (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/python-pillow/Pillow/commit/53318b50e8e9e85a57d033d4d879e1398d97aeb1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/python-pillow/Pillow/commit/ec5f1cbcf67275641abaad5c065ffb64a0a804a9 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-128067; retrieved 2026-11-12; source updated 2026-11-12

Revision: 9a20bb1f7c51be16aef6f59022057ff9fd87b58e161e1c2b0fe164f8c86aa399

Canonical: https://y2.dev/cve/CVE-2026-128067

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