CVE-2026-39919 Artifex Software CVE debrief

Who should care

Defenders responsible for systems using Ghostscript should assess exposure and prioritize remediation. This includes operators of systems that process PDF files, as well as security teams and vulnerability management teams responsible for ensuring the security of these systems. Additionally, platform administrators and security personnel should be aware of the potential risks and take steps to mitigate them. This vulnerability may also impact organizations

Why it matters

CVE-2026-39919 is a critical vulnerability in Ghostscript that could allow attackers to cause memory corruption and potentially execute arbitrary code. Defenders responsible for systems using Ghostscript should assess exposure and prioritize remediation.

• Potential code execution through crafted PDF files
• Memory corruption and denial of service
• Possible lateral movement through exploited systems

Technical summary

The vulnerability is caused by a heap-based buffer overflow in the JPEG 2000 output adapter. This occurs when image components declare different subsampling values, leading to a buffer overflow and corruption of internal chunk-allocator metadata. The affected product, Ghostscript, is a widely-used interpreter for PostScript and PDF files, making this vulnerability particularly concerning for defenders responsible for systems that process these types of files. The vulnerability can be exploited through crafted PDF files, which could lead to arbitrary code execution and memory corruption.

Defensive priority

High

Recommended defensive actions

• Upgrade Ghostscript to version 10.08.0 or later
• Restrict access to PDF files containing JPEG 2000 images
• Implement additional monitoring and logging to detect potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by a heap-based buffer overflow in the JPEG 2000 output adapter. This occurs when image components declare different subsampling values, leading to a buffer overflow and corruption of internal chunk-allocator metadata.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.