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

Quick assessment

Affected
python-pillow Pillow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pillow 是一个 Python 图像处理库。在 Windows 系统上，13.0.0 版本之前的 src/PIL/WmfImagePlugin.py 会将未经校验的 32 位 WMF 或 EMF 图像尺寸传递给位于 src/display.c 中的原生 drawwmf 处理程序。该处理程序根据被截断为 16 位的 bcWidth 和 bcHeight 字段来分配 DIB（设备无关位图）缓冲区，但随后却使用原始的完整尺寸来复制像素数据。攻击者可构造一个宽度极大、高度极小的元文件，从而绕过像素数量解压炸弹检查，导致

CVSS 7.1 · High EPSS 0.33% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow < 13.0.0 affected
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I. Basic Information for CVE-2026-96644

Vulnerability Information
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Vulnerability Title
Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
python-pillow Pillow < 13.0.0 -

II. Public POCs for CVE-2026-96644

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III. Intelligence Information for CVE-2026-96644

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Patches & Fixes for CVE-2026-96644 (2)

Vendor Advisories for CVE-2026-96644 (1)

Vendor Pages for CVE-2026-96644 (1)

Same Patch Batch · python-pillow · 2026-10-21 · 11 CVEs total

CVE-2026-96639 9.8 CRITICAL Pillow multi-frame loaders can reuse stale native image storage after mode transitions
CVE-2026-96640 8.2 HIGH Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion
CVE-2026-96778 7.7 HIGH Pillow: Heap buffer overflow writing JPEG comment after ICC profile fills buffer
CVE-2026-96642 7.1 HIGH Pillow: TarIO negative size field causes infinite CPU-spin loop
CVE-2026-96643 7.1 HIGH Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time
CVE-2026-96637 7.1 HIGH Pillow: Decompression bomb check bypass in SpiderImagePlugin.seek() leads to unbounded all
CVE-2026-96638 6.5 MEDIUM Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mod
CVE-2026-96641 6.5 MEDIUM Pillow: Reachable undefined behavior in native integer operations, potentially leading to
CVE-2026-96636 6.5 MEDIUM Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoIma
CVE-2026-114501 6.3 MEDIUM Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-125

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