Out-of-bounds Read Affecting pillow package, versions [,13.0.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-PILLOW-21430916
- published22 Oct 2026
- disclosed21 Oct 2026
- creditJoshua Rogers
Introduced: 21 Oct 2026
NewCVE-2026-96644 (opens in a new tab)How to fix?
Upgrade Pillow to version 13.0.0 or higher.
Overview
Pillow is a PIL (Python Imaging Library) fork.
Affected versions of this package are vulnerable to Out-of-bounds Read via the PyImaging_DrawWmf function in src/display.c when processing a WMF image with dimensions exceeding 65535. The bcWidth and bcHeight fields in BITMAPCOREHEADER are 16-bit unsigned integers, so values larger than 65535 silently truncate on assignment while the subsequent PyBytes_FromStringAndSize call still uses the untruncated values, causing a heap buffer over-read that crashes the process. An attacker can trigger this by supplying a WMF file with oversized width or height values.