CVE-2026-112405 Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0

What is CVE-2026-112405?

CVE-2026-112405 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. From 12.0.0 until 13.0.0, Pillow's Image.merge() can dereference a null image8 plane. Validation skips the first input band, allowing a 32-bit integer or floating-point image backed by image32 storage to be merged as a narrower multiband image. A crafted IPTC file can reach this path when an application opens and loads it, or a caller can invoke Image.merge() directly with such a first band. This causes a native process crash. This issue is fixed in version 13.0.0.

Weakness: CWE-476

Which versions are affected by CVE-2026-112405?

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

Products include Python Pillow.

How do I fix CVE-2026-112405?

Upgrade pillow to 13.0.0 or later.

Is CVE-2026-112405 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112405 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-2026-112405, DEBIAN-CVE-2026-112405, ECHO-b9cd-d360-326a, GHSA-cp9v-662q-vvx9, PYSEC-2026-4333, ROOT-APP-PYPI-CVE-2026-112405 and 1 more.