Buffer overflow in Artifex Software Ghostscript
CVE-2026-39919
Ghostscript before 10.08.0 contains a heap-based buffer overflow vulnerability in the JPEG 2000 output adapter (base/sjpx_openjpeg.c) that allows attackers to cause memory corruption by supplying a crafted PDF containing a JPEG 2000 image with mismatched component subsampling factors. When image components declare different subsampling values, the non-samescale sub-byte-depth output path allocates a row buffer sized for packed output but writes a full byte per output column regardless of bit depth, overflowing the allocation and corrupting internal chunk-allocator metadata to achieve code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (58.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/ArtifexSoftware/ghostpdl-downloads/releases/tag/gs10080 (release-notes)
- github.com/ArtifexSoftware/ghostpdl/commit/0a8bf88e39db07b0751a58d6ec1cf992073e… (patch)
- bugs.ghostscript.com/show_bug.cgi (issue-tracking)
- www.vulncheck.com/advisories/ghostscript-heap-buffer-overflow-via-jpeg-2000-out… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-39919?
- CVE-2026-39919 is a critical-severity vulnerability in Artifex Software Ghostscript, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-15.
- How severe is CVE-2026-39919?
- Critical severity. CVSS v3 base score is 9.8 out of 10.