Vulnerability record · CVE-2026-59200 · published 14 July 2026

CVE-2026-59200: Python pillow uncontrolled resource consumption vulnerability

Python · Pillow

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.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.6% CWE-400 · Uncontrolled resource consumptionCWE-770 · Allocation without limits

7.5CVSS 3.1 base score

0.66%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 2 tagged exploit

21 Jul 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Pillow Python

References

Link	Tags
https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09	Patch
https://github.com/python-pillow/Pillow/pull/9718	Issue TrackingPatch
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	ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565	ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-59200), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.