Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Artifex | Mupdf | >= 1.23.0, <= 1.27.0 |
Related Weaknesses (CWE)
References
- https://bugs.ghostscript.com/show_bug.cgi?id=709029ExploitIssue Tracking
- https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=d4743b6092d51Patch
- https://mupdf.com/Product
- https://www.vulncheck.com/advisories/mupdf-barcode-decoding-double-freeThird Party Advisory
FAQ
What is CVE-2026-25556?
CVE-2026-25556 is a vulnerability with a CVSS score of 7.5 (HIGH). 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-own...
How severe is CVE-2026-25556?
CVE-2026-25556 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25556?
Check the references section above for vendor advisories and patch information. Affected products include: Artifex Mupdf.