Buffer overflow in Python Pillow
CVE-2026-59199
Pillow is a Python imaging library. Prior to 12.3.0, Pillow public image coordinate APIs can trigger a native heap out-of-bounds write when given coordinates near the signed 32-bit integer limits in Image.paste(), Image.crop(), or Image.alpha_composite(). This issue is fixed in version 12.3.0.
Vulnerability class: Integer Overflow
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 < 12.3.0
Weakness classification (CWE)
References
- github.com/python-pillow/Pillow/commit/ceefc348eb3c3844c7f9796ef2cc3a7dd5fbba7b (Patch)
- github.com/python-pillow/Pillow/pull/9703 (Exploit, Patch, Issue Tracking)
- github.com/python-pillow/Pillow/releases/tag/12.3.0 (Release Notes)
- github.com/python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-59199?
- CVE-2026-59199 is a high-severity vulnerability in Python Pillow, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-07-14.
- How severe is CVE-2026-59199?
- High severity. CVSS v3 base score is 7.5 out of 10.