CVE-2026-71375 in Cosminexus Component Container
Summary
by MITRE • 09/08/2026
Improper restriction of XML external entity reference vulnerability in Cosminexus Component Container.
This issue affects Cosminexus Component Container: from 11-70-01 before 11-70-03, from 11-60 before 11-60-03, from 11-50 through 11-50-03, from 11-40 through 11-40-03, from 11-30 through 11-30-08, from 11-20 before 11-20-10, from 11-10 through 11-10-11, from 11-00 before 11-00-13, from 09-87 before 09-87-10, from 09-80 before 09-80-05, from 09-70 before 09-70-28, from 09-50 through 09-50-22, and from 09-00 through 09-00-18.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in Cosminexus Component Container represents a critical failure in input validation regarding XML parsing operations, specifically classified under the category of improper restriction of XML external entity references. This flaw allows an attacker to inject maliciously crafted XML documents that contain External Entity declarations. When the affected software processes these inputs without adequate sanitization or configuration restrictions, it interprets and resolves the entities according to standard XML processing rules rather than treating them as untrusted data. This behavior deviates from secure coding practices which dictate that external resource references should be disabled by default in environments where XML parsing is required for internal logic or user-provided content. The presence of this vulnerability indicates a fundamental gap in the application's security controls, permitting interactions with local file systems, network services, and other resources accessible to the process executing the parser.
The technical mechanism behind this exploitation relies on the Document Type Definition (DTD) processing capabilities inherent in many XML parsers. By defining an entity that points to a specific resource, such as a local file like etc/passwd or a remote server controlled by the attacker, the application is coerced into fetching and potentially exposing that content within its response or error logs. This can lead to Server-Side Request Forgery scenarios where the internal network topology is mapped through time-based blind attacks, or direct data exfiltration if the parsed output is reflected back to the user interface. The severity of this issue is compounded by the wide range of affected versions in Cosminexus Component Container, spanning from early 09-00 releases up to specific patch levels across multiple major version branches including 11-series and 09-series updates. This extensive footprint suggests that legacy systems or those with delayed update cycles are particularly at risk, as they may continue operating with known insecure configurations for extended periods.
From an operational impact perspective, successful exploitation can result in unauthorized access to sensitive internal data, denial of service through resource exhaustion via billion laughs attacks if entity expansion is not limited, and potential remote code execution depending on the specific parser implementation and underlying system privileges. The vulnerability aligns closely with CWE-611, which describes Improper Restriction of XML External Entity Reference, a common weakness in web applications that process user-supplied XML data. Furthermore, this activity maps to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically when the parsed entities trigger scripts or commands on the host system, although more commonly it aligns with reconnaissance techniques such as Network Service Scanning (T1046) if used for internal network discovery. The lack of explicit version constraints in some older branches means that organizations must audit their deployment configurations carefully to ensure they are not running vulnerable builds without appropriate compensating controls like web application firewalls configured to block DTD processing or XML bombs.
Mitigation strategies should prioritize immediate patching to the latest stable versions listed as unaffected, such as Cosminexus Component Container 11-70-03 and later for the 11-series, or equivalent fixed releases in older branches where available. For systems that cannot be immediately patched due to compatibility constraints, administrators must implement strict input validation policies that reject any XML documents containing DOCTYPE declarations or external entity definitions. Additionally, configuring the underlying XML parser library to disable DTD processing entirely is a robust defense-in-depth measure. This can often be achieved by setting specific features such as disallow-doctype-decl to true in Java-based parsers like JAXP or Xerces. Network-level controls should also be reviewed to ensure that the application server does not have unnecessary outbound connectivity, thereby limiting the potential impact of any successful SSRF attempts derived from this vulnerability. Regular security assessments and code reviews focusing on XML handling routines are essential to prevent similar flaws in future development cycles.