Description
A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Artifex | MuPDF | 1.28.0, 1.28.1, 1.28.2, 1.28.3, 1.28.4, 1.28.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mupdf | No fix yet | — |
| Debian 13 | mupdf | No fix yet | — |
| Debian 12 | mupdf | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mupdf | No fix yet | — |
| Ubuntu 26.04 LTS | mupdf | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mupdf | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mupdf | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mupdf | No fix yet | — |
| Ubuntu Pro 18.04 LTS | mupdf | No fix yet | — |
| Ubuntu Pro 16.04 LTS | mupdf | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mupdf | 1.28.6-2.1 | openSUSE-SU-2026:12487-1 |
Advisories 1
- openSUSE-SU-2026:12487-1 libmupdf28_6-1.28.6-2.1 on GA media SUSE / openSUSE Security Updates · Nov 9, 2026
References
- VDB-421684 | Artifex MuPDF Signature Locking pdf-xref.c free_char_list double free vdb-entry technical-description
- VDB-421684 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-112036 | CVE Analysis and Report third-party-advisory
- Submit #1008495 | MuPDF 1.28.5 Double Free third-party-advisory
- https://bugs.ghostscript.com/show_bug.cgi?id=709768 issue-tracking
- https://bugs.ghostscript.com/attachment.cgi?id=28609 exploit
- http://www.ghostscript.com/cgi-bin/findgit.cgi?3984925b660afb8a781ddf504021e91be1bc671e broken-link patch
- https://artifex.com/ product