CVE-2026-27297: Adobe FrameMaker RCE Vulnerability

CVE-2026-27297 Overview

Adobe Framemaker versions 2022.8 and earlier are affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could result in arbitrary code execution in the context of the current user. This vulnerability (CWE-191) occurs when an arithmetic operation produces a value that is smaller than the minimum representable value for the data type, causing the value to wrap around to a large positive number. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code with the privileges of the current user, potentially leading to complete system compromise when combined with privilege escalation techniques.

Affected Products

• Adobe Framemaker versions 2022.8 and earlier
• Adobe Framemaker running on Microsoft Windows
• All Adobe Framemaker 2022 release versions prior to patched versions

Discovery Timeline

• April 14, 2026 - CVE-2026-27297 published to NVD
• April 15, 2026 - Last updated in NVD database

Technical Details for CVE-2026-27297

Vulnerability Analysis

This Integer Underflow vulnerability in Adobe Framemaker represents a classic memory corruption flaw that affects document processing operations. When the application processes specially crafted input, arithmetic operations on size or length values can underflow, resulting in values that wrap around to unexpectedly large numbers. This miscalculation can lead to improper memory allocation or buffer operations, ultimately enabling arbitrary code execution.

The vulnerability requires local access and user interaction—specifically, a victim must be convinced to open a malicious document file. Once opened, the crafted file triggers the integer underflow condition during parsing or rendering operations, allowing an attacker to manipulate memory and execute code within the security context of the logged-in user.

Root Cause

The root cause of CVE-2026-27297 is an Integer Underflow (CWE-191) in Adobe Framemaker's file processing routines. When handling certain numeric values from document files, the application fails to properly validate input before performing arithmetic operations. This allows a subtraction or decrement operation to produce a value below zero, which then wraps to a maximum positive integer value. The corrupted value is subsequently used in memory operations such as buffer allocation or copy length calculations, leading to memory corruption conditions that can be exploited for code execution.

Attack Vector

The attack requires local access and user interaction. An attacker must craft a malicious Framemaker document file containing specially structured data that triggers the integer underflow condition. The attack scenario typically involves:

1. Attacker creates a malicious .fm or related document file with crafted numeric fields
2. Attacker delivers the file to the victim via email, file share, or other distribution method
3. Victim opens the malicious file in Adobe Framemaker
4. The integer underflow occurs during file parsing, corrupting memory
5. Attacker-controlled code executes with the privileges of the current user

The vulnerability does not require elevated privileges to exploit, but execution occurs within the user's security context. Organizations where users have administrative privileges face elevated risk of full system compromise.

Detection Methods for CVE-2026-27297

Indicators of Compromise

• Unexpected crashes or abnormal behavior in Adobe Framemaker when opening documents from untrusted sources
• Process anomalies such as FrameMaker.exe spawning unexpected child processes or making unusual network connections
• Memory access violations or application error logs indicating heap or stack corruption during document processing
• Suspicious Framemaker document files with anomalous size fields or malformed structure in headers

Detection Strategies

• Monitor for Adobe Framemaker process crashes followed by suspicious process creation events
• Implement file integrity monitoring for documents received from external sources before opening
• Deploy endpoint detection rules that alert on memory corruption patterns in Adobe Framemaker processes
• Utilize application whitelisting to prevent unauthorized code execution from document-based attacks

Monitoring Recommendations

• Enable detailed application logging for Adobe Framemaker to capture crash events and error conditions
• Configure SIEM rules to correlate Framemaker crashes with subsequent suspicious activity on the same endpoint
• Monitor email gateways and file transfer systems for Framemaker document files from untrusted sources
• Implement user awareness training to recognize and report suspicious document files

How to Mitigate CVE-2026-27297

Immediate Actions Required

• Update Adobe Framemaker to the latest patched version as described in the Adobe FrameMaker Security Advisory
• Restrict opening of Framemaker documents from untrusted or unknown sources until patching is complete
• Implement network segmentation to limit the impact of potential compromise through user-level code execution
• Review and audit user privileges to ensure principle of least privilege is enforced

Patch Information

Adobe has released a security update addressing CVE-2026-27297. Administrators should apply the patch referenced in security bulletin APSB26-36 immediately. The patch is available through Adobe's standard update mechanisms and the Adobe FrameMaker Security Advisory. Organizations should prioritize patching systems where Adobe Framemaker is used to process documents from external sources.

Workarounds

• Avoid opening Framemaker documents from untrusted or unknown sources until the patch is applied
• Implement Protected View or sandboxed document opening capabilities where available
• Use application virtualization or containerization to isolate Adobe Framemaker from critical system resources
• Configure email filters to quarantine Framemaker document attachments for manual review before delivery to end users