Heap-based buffer overflow in Pillow - CVE-2026-59205

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Main Vulnerability Database Vulnerabilities #VU137002

Heap-based buffer overflow in Pillow - CVE-2026-59205

Published: July 7, 2026


Vulnerability identifier: #VU137002
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59205
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in ImageCmsTransform.apply() when processing a caller-supplied output image whose mode does not match the transform's declared output mode. A remote attacker can supply a crafted output image object to cause a denial of service.

The issue is reachable through Pillow's public ImageCms API, and the source image pixels can influence the bytes written out of bounds.


Affected software

Pillow
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Python 3 Module
SUSE Package Hub 15
openSUSE Leap
openEuler
Anolis OS
python-Pillow-debuginfo
python3-Pillow-tk-debuginfo
python-Pillow-debugsource
python3-Pillow
python3-Pillow-tk
python3-Pillow-debuginfo
python-pillow
python3-pillow
python-pillow-debuginfo
python-pillow-debugsource
python3-pillow-devel
python3-pillow-qt
python3-pillow-tk
python3-pillow-help
python311-Pillow-tk
python311-Pillow-debuginfo
python311-Pillow
python311-Pillow-tk-debuginfo
python3-pillow-doc

How to mitigate CVE-2026-59205

Install security update from vendor's website.

Pillow - update to 12.3.0
python-Pillow-debuginfo - addressed in versions 7.2.0-150300.3.30.1, 9.5.0-150400.5.25.1
python3-Pillow-tk-debuginfo - update to 7.2.0-150300.3.30.1
python-Pillow-debugsource - addressed in versions 7.2.0-150300.3.30.1, 9.5.0-150400.5.25.1
python3-Pillow - update to 7.2.0-150300.3.30.1
python3-Pillow-tk - update to 7.2.0-150300.3.30.1
python3-Pillow-debuginfo - update to 7.2.0-150300.3.30.1
python-pillow - addressed in versions 9.0.1-16, 10.3.0-13
python3-pillow - addressed in versions 9.0.1-16, 10.3.0-13
python-pillow-debuginfo - addressed in versions 9.0.1-16, 10.3.0-13
python-pillow-debugsource - addressed in versions 9.0.1-16, 10.3.0-13
python3-pillow-devel - addressed in versions 9.0.1-16, 10.3.0-13
python3-pillow-qt - addressed in versions 9.0.1-16, 10.3.0-13
python3-pillow-tk - addressed in versions 9.0.1-16, 10.3.0-13
python3-pillow-help - addressed in versions 9.0.1-16, 10.3.0-13
python311-Pillow-tk - update to 9.5.0-150400.5.25.1
python311-Pillow-debuginfo - update to 9.5.0-150400.5.25.1
python311-Pillow - update to 9.5.0-150400.5.25.1
python311-Pillow-tk-debuginfo - update to 9.5.0-150400.5.25.1
python3-pillow - update to 12.2.0-3
python3-pillow-devel - update to 12.2.0-3
python3-pillow-qt - update to 12.2.0-3
python3-pillow-tk - update to 12.2.0-3
python3-pillow-doc - update to 12.2.0-3

External References

Related Security Bulletins