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CVE-2026-42309— Pillow: Heap buffer overflow with nested list coordinates

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Pillow开源的一款基于Python的图像处理库。 Pillow 11.2.1版本至12.2.0之前版本存在安全漏洞，该漏洞源于将嵌套列表作为坐标传递给API时可能导致堆缓冲区溢出。

AI Predicted 8.1 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow >= 11.2.1, < 12.2.0 affected
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I. Basic Information for CVE-2026-42309

Vulnerability Information
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Vulnerability Title
Pillow: Heap buffer overflow with nested list coordinates
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Pillow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pillow是Pillow开源的一款基于Python的图像处理库。 Pillow 11.2.1版本至12.2.0之前版本存在安全漏洞，该漏洞源于将嵌套列表作为坐标传递给API时可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
python-pillow Pillow >= 11.2.1, < 12.2.0 -

II. Public POCs for CVE-2026-42309

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III. Intelligence Information for CVE-2026-42309

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Patches & Fixes for CVE-2026-42309 (1)

Vendor Advisories for CVE-2026-42309 (1)

Same Patch Batch · python-pillow · 2026-05-09 · 4 CVEs total

CVE-2026-42308 Pillow: Integer overflow when processing fonts
CVE-2026-42311 Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow)
CVE-2026-42310 Pillow: PDF Parsing Trailer Infinite Loop (DoS)

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-122

V. Comments for CVE-2026-42309

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