CVE-2026-85965 in MarkLogic Server
Summary
by MITRE • 10/12/2026
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 contain memory-safety defects in the JavaScript engine integration that could result in memory corruption, controlled process failure, or server instability.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in Progress MarkLogic Server versions prior to 12.1.0 and 11.x releases before 11.3.7 stems from critical memory-safety defects within the integration layer of its embedded JavaScript engine. This component is responsible for executing server-side scripts that interact directly with database operations, document manipulation, and system administration tasks. The core technical flaw involves improper handling of memory allocation and deallocation during the execution of these JavaScript routines. Specifically, issues such as use-after-free conditions or buffer overflows can occur when the boundary between the managed Java environment and the native C++ codebase managing the V8 engine is not strictly enforced. These defects allow for unauthorized access to memory regions that should be isolated, leading to unpredictable behavior within the application runtime.
From a technical perspective, this flaw represents a classic class of vulnerabilities associated with low-level memory management errors in hybrid environments where managed and unmanaged code interact. The lack of rigorous bounds checking or reference validation during script execution enables an attacker who can trigger specific JavaScript functions to corrupt heap structures or overwrite adjacent memory blocks. This corruption does not necessarily lead directly to arbitrary code execution but creates a state of instability that is highly exploitable for denial-of-service attacks. By carefully crafting input data that triggers these memory-safety defects, an adversary can cause the MarkLogic server process to crash unexpectedly or enter an unstable state where it fails to respond to legitimate requests.
The operational impact of this vulnerability is significant for organizations relying on MarkLogic Server as a primary NoSQL database solution. The immediate consequence is a denial-of-service condition resulting from controlled process failure and general server instability. In high-availability environments, such crashes can lead to service interruptions, data unavailability during failover periods, and potential loss of in-flight transactions if the crash occurs during critical write operations. Furthermore, while the primary impact described is stability-related, memory corruption vulnerabilities often serve as a precursor to more severe exploits. If an attacker gains sufficient control over the corrupted memory state, they may potentially escalate privileges or execute arbitrary code on the host system, although this depends heavily on the specific deployment configuration and mitigations in place such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP).
This vulnerability aligns with Common Weakness Enumeration standards, particularly CWE-120 Buffer Copy without Checking Size of Input which describes classic buffer overflow scenarios, and CWE-416 Use After Free which pertains to accessing memory after it has been freed. In the context of the MITRE ATT&CK framework, this flaw facilitates techniques related to Defense Evasion through process injection or manipulation if exploited for code execution, but primarily supports Denial of Service tactics by disrupting service availability. The vulnerability highlights the risks inherent in complex software stacks that integrate multiple runtime environments without strict isolation boundaries.
To mitigate these risks, organizations must prioritize immediate patching to version 12.1.0 or later for MarkLogic Server 12.x, and version 11.3.7 or later for the 11.x branch. These updates contain specific fixes that address the memory-safety defects in the JavaScript engine integration by implementing stricter validation checks and improving memory management protocols. Until patches are applied, administrators should restrict access to any endpoints or functions that allow untrusted users to execute server-side JavaScript code. Implementing network-level controls such as firewalls to limit exposure of MarkLogic ports to only trusted internal networks can also reduce the attack surface. Additionally, enabling comprehensive logging and monitoring for unusual process restarts or memory usage spikes can help detect potential exploitation attempts in real-time, allowing for rapid incident response before significant operational disruption occurs.