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CVE-2026-42310— Pillow: PDF Parsing Trailer Infinite Loop (DoS)

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 4.2.0版本至12.2.0之前版本存在安全漏洞，该漏洞源于恶意PDF可能导致进程无限挂起，消耗100% CPU并使应用程序无响应。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
python-pillow Pillow >= 4.2.0, < 12.2.0 affected
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I. Basic Information for CVE-2026-42310

Vulnerability Information
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Vulnerability Title
Pillow: PDF Parsing Trailer Infinite Loop (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. 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
不可达退出条件的循环(无限循环)
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 4.2.0版本至12.2.0之前版本存在安全漏洞，该漏洞源于恶意PDF可能导致进程无限挂起，消耗100% CPU并使应用程序无响应。
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 >= 4.2.0, < 12.2.0 -

II. Public POCs for CVE-2026-42310

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III. Intelligence Information for CVE-2026-42310

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Patches & Fixes for CVE-2026-42310 (3)

Vendor Advisories for CVE-2026-42310 (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-2026-42309 Pillow: Heap buffer overflow with nested list coordinates

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-835

V. Comments for CVE-2026-42310

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