CVE-2026-112036 Artifex CVE debrief

Who should care

Defenders responsible for Artifex MuPDF installations, particularly those using versions up to 1.28.5, should assess exposure and prioritize patching to prevent potential exploitation.

Why it matters

CVE-2026-112036 is a double free vulnerability in Artifex MuPDF's Signature Locking component. Defenders should prioritize patching MuPDF installations to prevent potential exploitation. The vulnerability's impact and required remediation are supported by official CVE and NVD records.

• Potential remote code execution or denial-of-service
• Requires verification of affected versions and exposure
• Patching MuPDF installations is a priority
• Limited information available on actual exploitation

Technical summary

The vulnerability is located in the free_char_list function of the pdf-xref.c file in the MuPDF library, which is used for signature locking. An attacker can exploit this vulnerability remotely, potentially leading to a denial-of-service or code execution. Defenders should prioritize patching MuPDF installations to prevent potential double free vulnerabilities. The vulnerability's impact and required remediation are supported by official CVE and NVD records. Affected product deployments should be identified, and owners assigned for follow-up.

Defensive priority

Defenders should prioritize patching MuPDF installations to prevent potential double free vulnerabilities.

Recommended defensive actions

• Patch MuPDF installations to version 1.28.6 or later
• Verify MuPDF version and apply patch if necessary
• Monitor MuPDF installations for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including its impact on MuPDF's Signature Locking component and the availability of a patch. Defenders should verify affected versions, assess exposure, and prioritize patching to prevent potential exploitation. The vulnerability's impact and required remediation are supported by official CVE and NVD records. Limited information is available on actual exploitation, and defenders should monitor MuPDF installations for potential exploitation attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.