CVE-2026-27301: Adobe FrameMaker Buffer Overflow Flaw

CVE-2026-27301 Overview

Adobe Framemaker versions 2022.8 and earlier are affected by a Heap-based Buffer Overflow vulnerability (CWE-122) that could lead to memory exposure. An attacker could leverage this vulnerability to disclose sensitive information stored in memory. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Critical Impact

This heap-based buffer overflow vulnerability enables attackers to read sensitive information from memory when a user opens a specially crafted malicious file, potentially exposing confidential data processed by Adobe Framemaker.

Affected Products

• Adobe Framemaker versions 2022.8 and earlier
• Microsoft Windows (as the operating system platform)

Discovery Timeline

• April 14, 2026 - CVE-2026-27301 published to NVD
• April 15, 2026 - Last updated in NVD database

Technical Details for CVE-2026-27301

Vulnerability Analysis

This vulnerability is classified as a Heap-based Buffer Overflow (CWE-122), a memory corruption flaw where data is written beyond the allocated heap buffer boundaries. In this case, the overflow condition leads to information disclosure rather than code execution. When Adobe Framemaker processes a maliciously crafted file, the application fails to properly validate buffer boundaries during heap memory operations, allowing an attacker to read memory contents beyond the intended data structure.

The vulnerability requires local access and user interaction—specifically, the victim must be tricked into opening a malicious document file. Once opened, the heap overflow condition can expose sensitive information that resides in adjacent memory regions, such as application data, authentication tokens, or other confidential information processed by Framemaker.

Root Cause

The root cause lies in improper bounds checking during heap memory operations within Adobe Framemaker's file parsing functionality. When processing certain document structures, the application allocates a heap buffer but fails to properly validate the size of incoming data against the allocated buffer size. This allows data to overflow into adjacent heap memory regions, which can then be read by the attacker, leading to information disclosure.

Attack Vector

The attack vector is local, requiring user interaction to execute. An attacker would need to craft a malicious Framemaker document file (.fm, .book, or similar format) containing specially constructed data designed to trigger the heap buffer overflow condition. The attacker would then need to deliver this file to the victim through social engineering techniques such as:

• Email attachments disguised as legitimate documents
• Shared network drives or file sharing services
• Compromised websites offering document downloads

When the victim opens the malicious file using a vulnerable version of Adobe Framemaker, the heap overflow occurs during file parsing, exposing memory contents that can be exfiltrated back to the attacker through embedded mechanisms within the document or through network-based covert channels.

Detection Methods for CVE-2026-27301

Indicators of Compromise

• Unusual memory access patterns or crashes in the Framemaker.exe process
• Framemaker opening documents from untrusted or unexpected sources
• Abnormal network activity following document opening operations
• Memory dump files or crash reports indicating heap corruption

Detection Strategies

• Monitor for Adobe Framemaker processes exhibiting abnormal memory allocation patterns
• Implement file inspection for known malicious document signatures at email gateways and web proxies
• Deploy endpoint detection rules to identify heap overflow exploitation attempts targeting Framemaker
• Use application whitelisting to restrict Framemaker from opening documents from untrusted locations

Monitoring Recommendations

• Enable enhanced logging for Adobe Framemaker application events
• Configure endpoint security solutions to monitor heap memory operations in document processing applications
• Implement user behavior analytics to detect unusual document access patterns
• Review crash reports and Windows Error Reporting logs for Framemaker heap-related exceptions

How to Mitigate CVE-2026-27301

Immediate Actions Required

• Update Adobe Framemaker to the latest patched version as specified in Adobe Security Advisory APSB26-36
• Restrict opening of Framemaker documents from untrusted sources until patching is complete
• Implement user awareness training about the risks of opening unexpected document attachments
• Enable Protected View or similar sandboxing features if available

Patch Information

Adobe has released a security update to address this vulnerability. Users should apply the patch referenced in Adobe Security Advisory APSB26-36. Organizations should prioritize updating Adobe Framemaker installations, particularly on systems that process documents from external sources. Verify the patch has been applied by checking that Framemaker versions are newer than 2022.8.

Workarounds

• Implement strict file filtering at email gateways to quarantine or block Framemaker document formats from external senders
• Configure Group Policy or application controls to restrict Framemaker from opening files located in user download directories
• Deploy network segmentation to limit the impact of potential information disclosure
• Use virtual machine or sandbox environments for opening documents from untrusted sources