Double Free in Artifex Mupdf
CVE-2026-25556
MuPDF versions 1.23.0 through 1.27.0 contain a double-free vulnerability in fz_fill_pixmap_from_display_list() when an exception occurs during display list rendering. The function accepts a caller-owned fz_pixmap pointer but incorrectly drops the pixmap in its error handling path before rethrowing the exception. Callers (including the barcode decoding path in fz_decode_barcode_from_display_list) also drop the same pixmap in cleanup, resulting in a double-free that can corrupt the heap and crash the process. This issue affects applications that enable and use MuPDF barcode decoding and can be triggered by processing crafted input that causes a rendering-time error while decoding barcodes.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (45.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.005 · change: -0.002
Affected products
- Artifex Mupdf
- Artifex Software Mupdf — versions 1.23.0
Weakness classification (CWE)
References
- bugs.ghostscript.com/show_bug.cgi (issue-tracking, Exploit, Issue Tracking)
- cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/ (Patch, patch)
- mupdf.com/ (Product, product)
- www.vulncheck.com/advisories/mupdf-barcode-decoding-double-free (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-25556?
- CVE-2026-25556 is a high-severity vulnerability in Artifex Mupdf, classified under Double Free. CVSS score: 7.5/10. Published 2026-02-06.
- How severe is CVE-2026-25556?
- High severity. CVSS v3 base score is 7.5 out of 10.