Medium [CVE-2026-59203] Denial of Service via crafted EPS file
This medium-severity Red Hat Linux advisory covers CVE-2026-59203 affecting Lightspeed Core, OpenShift Lightspeed, Red Hat AI Inference Server.
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Summary
Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop.
This issue is fixed in version 12.3.0. A remote attacker could exploit this vulnerability by providing a specially crafted Encapsulated PostScript (EPS) file.
The EPS parser incorrectly handles negative byte counts, causing the system to enter an infinite loop when processing the file. This can lead to a Denial of Service (DoS), making the affected system unresponsive.
The impact is limited to denial of service via an infinite parsing loop. Exploitation requires the application to open a crafted EPS file, but does not lead to memory corruption or code execution.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-835.
Affected Red Hat products: Lightspeed Core; OpenShift Lightspeed; Red Hat AI Inference Server; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat Quay 3. Under investigation: Exploit Intelligence; Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Satellite 6.
Red Hat does not currently list a fixing RHSA for this CVE.
- 12.0.0
- 12.2.0
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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