CVE-2026-80160 in Acrobat Reader
Summary
by MITRE • 09/09/2026
Acrobat Reader is affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to disclose sensitive information. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 09/09/2026
The identified vulnerability represents a critical security flaw within Adobe Acrobat Reader, specifically categorized as an out-of-bounds read condition. This type of memory safety error occurs when the application attempts to access data at a memory location that lies outside the boundaries of the intended buffer or array structure. In the context of PDF processing engines, such vulnerabilities typically arise during the parsing and rendering of complex document structures where input validation fails to adequately constrain index values or pointer arithmetic operations. When an attacker crafts a malicious file with specifically manipulated metadata or object definitions, they can trigger this erroneous memory access sequence within the reader's execution environment.
From a technical perspective, out-of-bounds read vulnerabilities are particularly dangerous because they do not necessarily cause immediate application crashes but instead allow for the leakage of sensitive information stored in adjacent memory regions. The attacker leverages this flaw to read arbitrary bytes from the process memory space that were not intended to be exposed. This can include cryptographic keys, session tokens, passwords, or other proprietary data residing within the Acrobat Reader process address space. Unlike out-of-bounds write vulnerabilities which allow for code execution and full system compromise, out-of-bounds reads primarily facilitate information disclosure, serving as a reconnaissance tool that aids in further exploitation stages such as bypassing security mitigations like Address Space Layout Randomization by leaking memory layout details.
The operational impact of this vulnerability is significant due to the widespread adoption of Adobe Acrobat Reader across enterprise and consumer environments. Successful exploitation requires user interaction, meaning a victim must open or view the malicious file within the application. This social engineering requirement does not diminish the severity but rather defines the attack vector as client-side driven. Once triggered, the disclosure of sensitive memory contents can lead to privacy violations, intellectual property theft, or provide critical intelligence that enables subsequent attacks such as remote code execution through heap spraying techniques combined with information leaks. The ability to exfiltrate internal state data undermines the confidentiality guarantees expected from secure software implementations and poses a direct risk to organizational data security postures.
In terms of industry standard classifications, this vulnerability aligns closely with CWE-125, which defines out-of-bounds read errors involving access to memory beyond the end or beginning of an allocated buffer. Furthermore, within the MITRE ATT&CK framework, this behavior corresponds to techniques related to Tactic TA0006 (Credential Access) and specifically Technique T1005 (Data from Local System), as it involves gathering information directly from the victim's system memory without direct user modification of data files beyond opening them. It may also relate to T1203 (Exploitation for Client Execution) if used in conjunction with other exploits, though its primary function here is information disclosure rather than execution.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. The most effective mitigation is the prompt application of vendor-provided patches that address the specific memory handling logic flaws within the PDF parsing engine. Organizations should enforce strict update policies to ensure all endpoints have the latest security fixes installed. Additionally, implementing Application Control solutions such as Windows Defender Application Control or AppLocker can restrict Acrobat Reader from executing unless it originates from a trusted directory and has a valid digital signature, thereby preventing the execution of potentially malicious scripts embedded in PDFs. Network segmentation and endpoint detection and response tools should be configured to monitor for anomalous memory access patterns or unusual data exfiltration attempts originating from document viewing applications. User awareness training is also critical to reduce the likelihood of users opening unsolicited files that may contain such exploits, emphasizing caution when handling documents received via email or untrusted sources.