Resource exhaustion in Python Pillow
CVE-2026-59204
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- Python Pillow
- Python-Pillow Pillow — versions >= 8.2.0, < 12.3.0
Weakness classification (CWE)
References
- github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j (Exploit, Vendor Advisory)
- github.com/python-pillow/Pillow/pull/9704 (Exploit, Patch, Issue Tracking)
- github.com/python-pillow/Pillow/commit/13ada41172142f2fd9f0906f615a00ea623a11ca (Patch)
- github.com/python-pillow/Pillow/releases/tag/12.3.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-59204?
- CVE-2026-59204 is a high-severity vulnerability in Python Pillow, classified under CWE-789. CVSS score: 7.5/10. Published 2026-07-14.
- How severe is CVE-2026-59204?
- High severity. CVSS v3 base score is 7.5 out of 10.