CVE-2026-47915 Overview
CVE-2026-47915 is a Use After Free vulnerability [CWE-416] affecting Adobe Acrobat Reader versions 24.001.30365, 26.001.21651, and earlier. Successful exploitation results in arbitrary code execution in the context of the current user. The flaw requires user interaction: a victim must open a crafted malicious PDF file. Adobe addressed the issue in security bulletin APSB26-63.
Critical Impact
Attackers can execute arbitrary code with the privileges of the user who opens a malicious PDF, enabling endpoint compromise through phishing or drive-by document delivery.
Affected Products
- Adobe Acrobat Reader version 24.001.30365
- Adobe Acrobat Reader version 26.001.21651
- Earlier Acrobat Reader versions in both release tracks
Discovery Timeline
- 2026-06-09 - CVE-2026-47915 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-47915
Vulnerability Analysis
The vulnerability is a Use After Free condition within Adobe Acrobat Reader's PDF processing logic. Use After Free flaws occur when a program continues to reference memory after it has been freed. Attackers can groom the heap so that the freed allocation is replaced with attacker-controlled data before the dangling pointer is dereferenced.
When Acrobat Reader operates on the stale pointer, the controlled data drives object method calls or virtual table dispatch. This redirects execution flow to attacker-supplied gadgets or shellcode, achieving arbitrary code execution within the Reader process. Because Reader runs in user context, the attacker inherits the victim's filesystem, network, and credential access.
Root Cause
The root cause is improper object lifetime management [CWE-416] inside the PDF parsing or rendering routines. A reference to a heap object persists after the object is deallocated, leaving a dangling pointer that the program later uses for reads, writes, or indirect calls.
Attack Vector
Exploitation requires local file processing with user interaction. A victim must open a malicious PDF, typically delivered through email attachments, malicious links, or compromised file shares. No elevated privileges are required for the attacker, and successful execution yields high impact to confidentiality, integrity, and availability of the user session. No verified public exploit or proof-of-concept code is currently available.
Detection Methods for CVE-2026-47915
Indicators of Compromise
- Acrobat Reader process (AcroRd32.exe or Acrobat.exe) spawning unexpected child processes such as cmd.exe, powershell.exe, or rundll32.exe.
- Unexpected outbound network connections originating from Acrobat Reader following the opening of a PDF.
- Crash dumps or Windows Error Reporting events referencing access violations inside Acrobat Reader modules.
- PDF files containing suspicious embedded JavaScript, malformed object streams, or unusual cross-reference tables.
Detection Strategies
- Monitor parent-child process relationships where Acrobat Reader launches scripting interpreters or LOLBins.
- Hunt for file writes to user-writable autorun, Startup, or Scheduled Task locations performed by Acrobat Reader.
- Inspect email gateways and proxy logs for PDF attachments matching threat intelligence on PDF exploit campaigns.
Monitoring Recommendations
- Enable EDR telemetry for module loads and memory protection changes within Acrobat Reader processes.
- Correlate user-opened document events with subsequent network egress and credential access attempts.
- Track Acrobat Reader version inventory across endpoints to verify patch deployment status.
How to Mitigate CVE-2026-47915
Immediate Actions Required
- Apply the Adobe security update referenced in APSB26-63 to all affected endpoints.
- Inventory Acrobat Reader installations and prioritize systems running 24.001.30365, 26.001.21651, or earlier.
- Block inbound PDF attachments from untrusted senders at the email gateway until patching completes.
Patch Information
Adobe released fixed versions through security bulletin APSB26-63. Administrators should update Acrobat Reader to the latest available release on both the Classic Track (24.001.x) and the Continuous Track (26.001.x).
Workarounds
- Enable Protected View and Protected Mode in Acrobat Reader to sandbox PDF rendering.
- Disable JavaScript execution within Acrobat Reader via Preferences or Group Policy on managed endpoints.
- Restrict opening of PDF files from internet-zone or untrusted sources using attachment policies.
# Disable JavaScript and enforce Protected View via Windows registry (managed endpoints)
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\JSPrefs" /v bEnableJS /t REG_DWORD /d 0 /f
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\TrustManager" /v iProtectedView /t REG_DWORD /d 2 /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
