Resource exhaustion in Pillow - CVE-2026-59200

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Main Vulnerability Database Vulnerabilities #VU137009

Resource exhaustion in Pillow - CVE-2026-59200

Published: July 7, 2026


Vulnerability identifier: #VU137009
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-2026-59200
CWE-ID: CWE-400
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 uncontrolled resource consumption in PdfParser.PdfStream.decode() in Pillow's PdfParser.py when parsing a crafted FlateDecode-compressed PDF stream. A remote attacker can submit a specially crafted PDF file to cause a denial of service.

The issue occurs because zlib.decompress() is called with the PDF stream Length or DL value as an initial buffer hint without limiting the actual decompressed output size.


Affected software

Pillow
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 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
python-pillow-debuginfo
python-pillow-debugsource
python3-pillow
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-2026-59200

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 9.0.1-12, 10.3.0-8, 10.3.0-13
python-pillow-debuginfo - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python-pillow-debugsource - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python3-pillow - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python3-pillow-devel - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python3-pillow-qt - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python3-pillow-tk - addressed in versions 9.0.1-12, 10.3.0-8, 10.3.0-13
python3-pillow-help - addressed in versions 9.0.1-12, 10.3.0-8, 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