1. Ubuntu Security Notices
  2. USN-8999-1

USN-8999-1: Pillow vulnerabilities

Publication date

4 November 2026

Overview

Several security issues were fixed in Pillow.

Releases

Packages

  • pillow - Python Imaging Library

Details

It was discovered that Pillow incorrectly handled map stride values
when loading certain McIdas AREA images. An attacker could possibly
use this issue to obtain sensitive information or cause a denial of
service. (CVE-2026-54058)

It was discovered that Pillow did not properly check for decompression
bombs when processing font files. An attacker could possibly use this
issue to cause Pillow to consume excessive memory, resulting in a
denial of service. (CVE-2026-54059, CVE-2026-54060, CVE-2026-55379)

It was discovered that Pillow did not properly check for decompression
bombs when loading GD image files. An attacker could possibly use this
issue to cause Pillow to consume excessive memory, resulting in a
denial of service. (

It was discovered that Pillow incorrectly handled map stride values
when loading certain McIdas AREA images. An attacker could possibly
use this issue to obtain sensitive information or cause a denial of
service. (CVE-2026-54058)

It was discovered that Pillow did not properly check for decompression
bombs when processing font files. An attacker could possibly use this
issue to cause Pillow to consume excessive memory, resulting in a
denial of service. (CVE-2026-54059, CVE-2026-54060, CVE-2026-55379)

It was discovered that Pillow did not properly check for decompression
bombs when loading GD image files. An attacker could possibly use this
issue to cause Pillow to consume excessive memory, resulting in a
denial of service. (CVE-2026-55380)

It was discovered that Pillow incorrectly validated filter sizes in
the rank filter implementation. An attacker could possibly use this
issue to cause Pillow to crash or execute arbitrary code.
(CVE-2026-59197)

It was discovered that Pillow incorrectly handled image coordinate
calculations. An attacker could possibly use this issue to cause
Pillow to crash. (CVE-2026-59199)

It was discovered that Pillow did not properly limit the size of
decompressed PDF stream data. An attacker could possibly use this
issue to cause Pillow to consume excessive memory, resulting in a
denial of service. (CVE-2026-59200)

It was discovered that Pillow incorrectly parsed EPS files containing
a negative byte count in the BeginBinary directive. An attacker could
possibly use this issue to cause Pillow to hang, resulting in a denial
of service. This issue only affected Ubuntu 26.04 LTS.
(CVE-2026-59203)

It was discovered that Pillow incorrectly accumulated JPEG2000 tile
component widths. An attacker could possibly use this issue to cause
Pillow to consume excessive memory, resulting in a denial of service.
(CVE-2026-59204)

It was discovered that Pillow incorrectly validated image mode
compatibility in color management transforms. An attacker could
possibly use this issue to cause Pillow to crash or execute arbitrary
code. (CVE-2026-59205)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
26.04 LTS resolute python3-pil –  12.1.1-2ubuntu1.4
24.04 LTS noble python3-pil –  10.2.0-1ubuntu1.4
22.04 LTS jammy python3-pil –  9.0.1-1ubuntu0.6

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References

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