Vulnerability · Published Feb 6, 2026 · Assigned by VulnCheck
CVE-2026-25556MuPDF 1.23.0 through 1.27.0 Barcode Decoding Double Free
Medium 5.9
In plain English
A medium-severity double free in MuPDF from Artifex Software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | mupdf | no fix listed | DEBIAN-CVE-2026-25556 |
| Debian:14 | mupdf | 1.27.0+ds1-3 | DEBIAN-CVE-2026-25556 |
| Ubuntu:25.10 | mupdf | no fix listed | UBUNTU-CVE-2026-25556 |
| Ubuntu:26.04:LTS | mupdf | no fix listed | UBUNTU-CVE-2026-25556 |
| Ubuntu:26.10 | mupdf | no fix listed | UBUNTU-CVE-2026-25556 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Artifex Software | MuPDF | 1.23.0 – through 1.27.0 |
Weakness: CWE-415 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N