CVE-2026-59200 | Pillow is a Python imaging library. From 5.1.0 until 12.3.0,… | CVSS 7.5 HIGH

Description

Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0.

Metadata

CVE ID: CVE-2026-59200
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-02 19:53 UTC
Published: 2026-07-14 16:09 UTC
Last updated: 2026-07-14 19:52 UTC
Primary CWE: CWE-400
CWE-400: Uncontrolled Resource Consumption
Vendor / Product: python-pillow / Pillow
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
python-pillow	Pillow	—	>= 5.1.0, < 12.3.0

Weakness (CWE)

CWE	Source	Description
CWE-400	cna	CWE-400: Uncontrolled Resource Consumption
CWE-770	cna	CWE-770: Allocation of Resources Without Limits or Throttling

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (4)

https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565
https://github.com/python-pillow/Pillow/pull/9718 https://github.com/python-pillow/Pillow/pull/9718
https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09
https://github.com/python-pillow/Pillow/releases/tag/12.3.0 https://github.com/python-pillow/Pillow/releases/tag/12.3.0