CyberSecurity News

Critical Flaw in Python’s Popular Pillow Image Library Allows Code Execution via a Crafted Image

The Hacker News

· October 23, 2026

AI summary

A critical vulnerability has been discovered in Pillow, a widely used Python image library. The flaw allows an attacker to execute operating system commands on a server by specifying a crafted file name. This issue arises from Pillow's handling of EPS images, which are opened using the Ghostscript program. The vulnerability occurs because Pillow passes the file name to Ghostscript without first checking it. The identified flaw has been assigned the CVE-2026-112900 designation.

Vulnerabilities mentioned

CVE-2026-112900

UNKNOWN

Pillow is a Python imaging library. From 2.6.0 until 13.0.0, Pillow is vulnerable to argument injection when invoking Ghostscript for EPS input. EpsImagePlugin.Ghostscript passes a caller-controlled input filename after -f without converting it to a safe absolute path, so a name beginning with a hyphen can be interpreted as a Ghostscript option. An attacker who controls the filename can inject Ghostscript arguments. Arbitrary command execution specifically requires a leading @ argument-file filename and control of the referenced text file containing additional Ghostscript arguments; the reported chain reproduces with the default -dSAFER invocation. This issue is fixed in version 13.0.0.

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