CVE-2026-112896 Pillow: TIFF encoder ColorMap plane-size mismatch causes a heap out-of-bounds read

What is CVE-2026-112896?

CVE-2026-112896 is a high-severity vulnerability in Python Pillow, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's TIFF encoder can read beyond a ColorMap buffer when retained TIFF metadata has a plane size inconsistent with BitsPerSample. A small TIFF can be opened normally and then retain a crafted ColorMap that is reused when the image is saved. An application that re-encodes the attacker's TIFF with libtiff can trigger the out-of-bounds read. This can disclose heap memory in the output or crash the process. This issue is fixed in version 13.0.0.

Weakness: CWE-125

Which versions are affected by CVE-2026-112896?

4 open source packages ship an affected version, including pillow and Pillow. It affects 1 product.

Products include Python Pillow.

How do I fix CVE-2026-112896?

Upgrade pillow to 13.0.0 or later.

Is CVE-2026-112896 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112896 exists.

Other vulnerabilities in Python Pillow

• CVE-2014-3007 Pillow command injection Critical 10.0
• CVE-2026-96639 Pillow multi-frame loaders can reuse stale native image storage after mode transitions Critical 9.8
• CVE-2022-30595 Buffer over-flow in Pillow Critical 9.8
• CVE-2021-25289 Out of bounds write in Pillow Critical 9.8
• CVE-2016-4009 Pillow Integer overflow in ImagingResampleHorizontal Critical 9.8

All Python Pillow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-pillow-2026-112896, DEBIAN-CVE-2026-112896, ECHO-6c6e-61ed-491d, GHSA-pchr-8j38-3x4p, PYSEC-2026-4334, ROOT-APP-PYPI-CVE-2026-112896 and 1 more.