High 7.1Published Oct 21, 2026

CVE-2026-96644Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)

Updated under an hour ago (Oct 26, 2026, 1:40 PM ET)

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It affects python-pillow Pillow. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.33%, higher than 25% of scored CVEs.

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Every CVE for python-pillow Pillow

Exploited in the last 30 days

Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.

CVSS: 7.1 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.33% (percentile 25)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

python-pillow Pillow python_pillow:pillow (from the name)	before 13.0.0	CNA record

References

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj	x-refsource-confirm
https://github.com/python-pillow/Pillow/pull/10120	x-refsource-misc
https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7	x-refsource-misc
https://github.com/python-pillow/Pillow/releases/tag/13.0.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.