Cyber Resilience

CVE-2026-42311

High

Published: 09 May 2026

Published
09 May 2026
Modified
14 May 2026
KEV Added
—
Patch
—
CVSS Score v4 8.6 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0015 4.6th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-42311 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Python Pillow. Its CVSS base score is 8.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 4.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

This vulnerability is AI-related — categorised as Computer Vision; in the Data-Related Vulnerabilities risk domain.

EU & UK References

Vulnerability details

Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. This issue has been patched in version 12.2.0.

CWE(s)
CWE-190CWE-787

AI Security AnalysisAI

AI Category
Computer Vision
Risk Domain
Data-Related Vulnerabilities
OWASP Top 10 for LLMs 2025
None mapped
Classification Reason
Matched keywords: pillow

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1204.002 Malicious File Execution
An adversary may rely upon a user opening a malicious file in order to gain execution.
attack.mitre.org →
Why these techniques?

Memory corruption in image library enables RCE via malicious PSD file processing, directly mapping to client-side exploitation and malicious file execution.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

Affected Assets

python
pillow
10.3.0 — 12.2.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References