CVE-2026-25990 Pillow has an out-of-bounds write when loading PSD images

High 8.6 Published 11 Feb 2026 Updated 16 Sep 2026

An out-of-bounds write in Pillow allows attackers to execute arbitrary code or cause denial of service via crafted PSD images.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-25990?

CVE-2026-25990 is a high-severity memory corruption vulnerability in Python Pillow, published on 11 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Pillow is a Python imaging library. From 10.3.0 to before 12.1.1, an out-of-bounds write may be triggered when loading a specially crafted PSD image. This vulnerability is fixed in 12.1.1.

Weakness: CWE-787

Which versions are affected by CVE-2026-25990?

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

Package	Affected	Fixed in
`pillow` Bitnami	From `10.3.0`	`12.1.1`
`pillow` PyPI	From `10.3.0`	`12.1.1`
`pillow` PyPI	From `10.3.0`	`12.1.1`
`pillow` PyPI	From `10.3.0`	`12.1.1`

Linux distribution packages (4)

`python-Pillow` SUSE:Linux Enterprise Server 16.0	All versions	`11.3.0-160000.3.1`
`python-Pillow` SUSE:Linux Enterprise Server for SAP applications 16.0	All versions	`11.3.0-160000.3.1`
`python-Pillow` openSUSE:Leap 16.0	All versions	`11.3.0-160000.3.1`
`python-Pillow` openSUSE:Tumbleweed	All versions	`12.1.1-1.1`

Products include Python Pillow.

How do I fix CVE-2026-25990?

Upgrade pillow to 12.1.1 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-25990 being exploited?

There is no known exploitation of CVE-2026-25990 in the wild and no public exploit code.

All Python Pillow vulnerabilities

Sources

Also known as BIT-pillow-2026-25990, CLEANSTART-2026-LD17391, CLEANSTART-2026-UB59787, CLSA-2026-1774830261, CLSA-2026-1774830267, DEBIAN-CVE-2026-25990 and 17 more.