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…
Vulnerability class: Integer Overflow
EPSS: 0.000 (5.7th percentile) — read the EPSS interpretation.
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.
Affected products
- Python Pillow
- Python-pillow Pillow — versions >= 10.3.0, < 12.2.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, 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.