CVE-2026-59200
Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
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.
INFO
Published Date :
July 14, 2026, 5:17 p.m.
Last Modified :
July 21, 2026, 3:52 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Pillow to version 12.3.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59200.
| URL | Resource |
|---|---|
| https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 | Patch |
| https://github.com/python-pillow/Pillow/pull/9718 | Issue Tracking Patch |
| https://github.com/python-pillow/Pillow/releases/tag/12.3.0 | Release Notes |
| https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 | Exploit Vendor Advisory |
| https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59200 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59200
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59200 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59200 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:* versions from (including) 5.1.0 up to (excluding) 12.3.0 Added Reference Type GitHub, Inc.: https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/python-pillow/Pillow/pull/9718 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/python-pillow/Pillow/releases/tag/12.3.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 Added SSVC {'id': 'CVE-2026-59200', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-14T19:43:40.467012Z'} -
New CVE Received by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'python-pillow', 'product': 'Pillow', 'versions': [{'status': 'affected', 'version': '>= 5.1.0, < 12.3.0'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added CWE CWE-770 Added Reference https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09 Added Reference https://github.com/python-pillow/Pillow/pull/9718 Added Reference https://github.com/python-pillow/Pillow/releases/tag/12.3.0 Added Reference https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565