Buffer overflow in Python Pillow
CVE-2026-42311
Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. This issue has been patched in version 12.2.0.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (11.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Python Pillow
- Python-Pillow Pillow — versions >= 10.3.0, < 12.2.0
Weakness classification (CWE)
References
- github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr (Patch, Vendor Advisory)
- github.com/python-pillow/Pillow/pull/9520 (Patch, Issue Tracking)
- github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea (Patch)
- github.com/python-pillow/Pillow/releases/tag/12.2.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-42311?
- CVE-2026-42311 is a high-severity vulnerability in Python Pillow, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2026-05-09.
- How severe is CVE-2026-42311?
- High severity. CVSS v3 base score is 7.8 out of 10.