Vulnerability record · CVE-2026-59204 · published 14 July 2026

CVE-2026-59204: Python pillow allocation without limits vulnerability

Python · Pillow

Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. This issue is fixed in version 12.3.0.

8.7 CVSS 4.0 High EPSS 0.66% · top 50.7% CWE-789 · CWE-789CWE-770 · Allocation without limits

8.7CVSS 4.0 base score

0.66%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

5References, 3 tagged exploit

21 Jul 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

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/13ada41172142f2fd9f0906f615a00ea623a11ca	Patch
https://github.com/python-pillow/Pillow/pull/9704	ExploitIssue TrackingPatch
https://github.com/python-pillow/Pillow/releases/tag/12.3.0	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j	ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j	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-2026-59204), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.