CVE-2026-47914 Overview
CVE-2026-47914 is a Use After Free vulnerability [CWE-416] affecting Adobe Acrobat Reader versions 24.001.30365, 26.001.21651, and earlier. Successful exploitation allows arbitrary code execution in the context of the current user. The vulnerability requires user interaction: a victim must open a malicious file crafted by the attacker. Adobe published a security advisory tracking this issue and released updated builds to remediate the flaw. The vulnerability has a local attack vector with high impact on confidentiality, integrity, and availability.
Critical Impact
Attackers can achieve arbitrary code execution in the context of the current user by convincing a victim to open a malicious PDF document.
Affected Products
- Adobe Acrobat Reader 24.001.30365 and earlier
- Adobe Acrobat Reader 26.001.21651 and earlier
- Adobe Acrobat (corresponding tracks affected by APSB26-63)
Discovery Timeline
- 2026-06-09 - CVE-2026-47914 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-47914
Vulnerability Analysis
The flaw is a Use After Free condition [CWE-416] in Adobe Acrobat Reader's document processing logic. Use After Free occurs when a program continues to reference memory after it has been freed. Attackers can manipulate the freed memory region to control execution flow. In Acrobat Reader, this class of bug typically arises during parsing of complex PDF objects, JavaScript handlers, or XFA form elements. Once the dangling pointer is dereferenced, an attacker-controlled object can be placed in the reclaimed memory. This allows hijacking of virtual function tables or function pointers, leading to arbitrary code execution under the privileges of the user opening the file.
Root Cause
The root cause is improper object lifetime management within Acrobat Reader. A component releases a heap object while another code path retains a reference to it. When the stale reference is later used, the allocator may have already reused the memory for an attacker-controlled allocation. This violates the safe-use contract for freed pointers and creates a deterministic primitive for memory corruption.
Attack Vector
Exploitation requires local user interaction. An attacker delivers a malicious PDF through email, web download, or a shared file location. When the victim opens the document in a vulnerable Acrobat Reader build, the embedded payload triggers the Use After Free condition. The attacker then leverages heap grooming and address space layout primitives to achieve code execution. No elevated privileges are required, and successful exploitation runs code with the current user's permissions.
No public proof-of-concept code is available. Refer to the Adobe Acrobat Security Advisory APSB26-63 for vendor technical details.
Detection Methods for CVE-2026-47914
Indicators of Compromise
- PDF files containing unusual embedded JavaScript, malformed object streams, or suspicious XFA constructs received from untrusted sources.
- Acrobat Reader processes (AcroRd32.exe, Acrobat.exe) spawning command interpreters such as cmd.exe, powershell.exe, or wscript.exe.
- Crashes or unexpected exits of Acrobat Reader correlated with opening a specific PDF document.
Detection Strategies
- Monitor process lineage for Acrobat Reader spawning child processes outside of normal updater or helper executables.
- Inspect endpoint memory telemetry for heap corruption indicators and exception events originating from Acrobat modules.
- Hunt for PDFs delivered via email attachments or web downloads that contain heavily obfuscated JavaScript or unusual object reference counts.
Monitoring Recommendations
- Enable EDR telemetry for file open events tied to Acrobat Reader and correlate with subsequent network or process activity.
- Track installed Acrobat Reader versions across the fleet and alert when builds older than the patched releases are detected.
- Forward email gateway logs and web proxy logs to a centralized analytics platform to identify malicious PDF delivery patterns.
How to Mitigate CVE-2026-47914
Immediate Actions Required
- Update Adobe Acrobat Reader to the fixed versions identified in Adobe Security Bulletin APSB26-63.
- Inventory endpoints to identify systems still running vulnerable builds 24.001.30365, 26.001.21651, or earlier.
- Block inbound PDF attachments from untrusted senders at the email gateway until patches are deployed.
Patch Information
Adobe addressed CVE-2026-47914 in the security update tracked under advisory APSB26-63. Apply the latest Acrobat and Reader builds available through Adobe's update channel or enterprise deployment tools. Verify patched versions on managed endpoints after rollout.
Workarounds
- Enable Protected View and Protected Mode in Acrobat Reader to sandbox document rendering.
- Disable JavaScript execution within Acrobat Reader through the Preferences menu or enterprise GPO if it is not required for business workflows.
- Restrict opening of PDF files from untrusted sources using application control or file origin policies.
# Configuration example: disable JavaScript in Adobe Acrobat Reader via Windows registry
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\JSPrefs" /v bEnableJS /t REG_DWORD /d 0 /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
