CVE-2026-87100 in Cyber Protect
Summary
by MITRE • 10/28/2026
Protection mechanism failure due to missing binary hardening in Linux executables. The following products are affected: Acronis Cyber Protect 17 (Linux) before build 42587.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability described represents a critical protection mechanism failure stemming from the absence of essential binary hardening techniques in Linux executable files associated with Acronis Cyber Protect version 17 prior to build 42587. Binary hardening refers to a set of compiler and linker flags designed to mitigate common exploitation techniques by modifying how an application behaves at runtime when memory corruption or other errors occur. The lack of these protections leaves the software vulnerable to standard attack vectors that target low-level memory management flaws, significantly increasing the risk of successful remote code execution or privilege escalation attacks against systems running this specific version of the product.
At a technical level, modern operating systems employ several layers of defense-in-depth mechanisms to prevent exploits from achieving their full impact even if a vulnerability is triggered. Key among these are Address Space Layout Randomization, which randomizes memory addresses to make predicting locations difficult for attackers; Stack Canaries, which detect stack buffer overflows by placing a sentinel value before return addresses; and Non-Executable stacks or heaps, which prevent the execution of injected code stored in writable memory regions. Additionally, Control Flow Integrity ensures that program execution follows only valid paths defined at compile time, while Position Independent Executables allow for more effective ASLR implementation. The identified deficiency indicates that Acronis Cyber Protect 17 before build 42587 was compiled without these critical flags, effectively disabling these operating system-level safeguards and leaving the application exposed to memory corruption exploits such as buffer overflows or use-after-free conditions.
The operational impact of this vulnerability is severe due to its potential for exploitation by threat actors seeking initial access or lateral movement within an enterprise environment. Without binary hardening mechanisms in place, a successful exploit could allow an attacker to gain arbitrary code execution with the privileges of the vulnerable process. In the context of Acronis Cyber Protect, which typically runs with elevated permissions to manage backups and security policies across networks, this could lead to full system compromise. Attackers could leverage this weakness to install malware, exfiltrate sensitive data, or pivot to other systems on the network. This aligns closely with CWE-1068 Improper Privilege Management and CWE-94 Improper Control of Generation of Code Command Injection if the vulnerability allows for command injection via memory corruption techniques. Furthermore, it relates to ATT&CK technique T1203 Exploitation for Client Execution, as attackers often rely on such vulnerabilities to execute malicious payloads directly on target systems without needing additional delivery mechanisms beyond a simple exploit trigger.
Mitigation strategies must focus on both immediate remediation and long-term secure development practices. The primary recommendation is to upgrade Acronis Cyber Protect 17 to build 42587 or later, where the vendor has presumably implemented the necessary binary hardening flags during compilation. For organizations unable to immediately patch due to compatibility concerns, applying network-level controls such as strict firewall rules and intrusion prevention system signatures can help mitigate exploitation attempts by blocking known exploit traffic patterns. Additionally, implementing application whitelisting policies can restrict the execution of unauthorized binaries, reducing the impact if an attacker does manage to trigger a vulnerability. From a development perspective, integrating static analysis tools that check for missing hardening flags into the continuous integration pipeline is essential to prevent similar issues in future releases. Developers should ensure that all Linux executables are compiled with standard security flags including -fstack-protector-strong, -D_FORTIFY_SOURCE=2, and linker options like -Wl,-z,relro,-z,now to enforce full RELRO and NX bit enforcement. Regular audits of build configurations against industry standards such as the CIS Benchmarks for Linux will help maintain a strong security posture and ensure that protection mechanisms remain robust against evolving threat landscapes.