CVE-2026-25556

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.

PUBLISHED Reserved 2026-02-02 | Published 2026-02-06 | Updated 2026-02-06 | Assigner VulnCheck

Problem types

CWE-415 Double Free

Product status

Credits

Pavel Kohout, Aisle Research (www.aisle.com) finder

References

bugs.ghostscript.com/show_bug.cgi?id=709029 issue-tracking

cgit.ghostscript.com/...3b6092d513321c23c6f7fe5cff87cde043c1 patch

mupdf.com/ product

www.vulncheck.com/...ries/mupdf-barcode-decoding-double-free third-party-advisory

cve.org (CVE-2026-25556)

nvd.nist.gov (CVE-2026-25556)

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