CVE-2026-11348 in Liman MYS
Summary
by MITRE • 07/07/2026
Improper verification of cryptographic signature vulnerability in HAVELSAN Inc. Liman MYS allows Fake the Source of Data.
This issue affects Liman MYS: before release.Master.1107.
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Analysis
by VulDB Data Team • 07/07/2026
The vulnerability identified in HAVELSAN Inc.'s Liman MYS software represents a critical cryptographic signature verification flaw that fundamentally undermines the integrity and authenticity guarantees of the system. This weakness enables malicious actors to forge data sources and manipulate system behavior through unauthorized modifications. The issue manifests in the improper validation of cryptographic signatures, which should normally ensure that data originates from legitimate sources and has not been tampered with during transmission or storage. When signature verification fails, the system accepts potentially malicious data as authentic, creating a dangerous trust boundary violation.
The technical implementation flaw stems from inadequate cryptographic verification mechanisms within the Liman MYS framework. Specifically, the software appears to either bypass signature validation entirely, employ weak cryptographic algorithms, or fail to properly validate signature authenticity before processing data. This vulnerability aligns with CWE-327, which addresses broken cryptographic implementations and improper use of cryptographic primitives. The root cause likely involves insufficient input validation of digital signatures, where the system does not adequately check signature integrity or verify that signatures correspond to legitimate keys. Attackers can exploit this by generating forged signatures or by bypassing signature checks altogether.
The operational impact of this vulnerability extends far beyond simple data integrity concerns and creates significant security risks for organizations relying on Liman MYS systems. Malicious actors can manipulate critical system operations, inject false data into processes, and potentially gain unauthorized access to sensitive information or system controls. This vulnerability particularly threatens industrial control systems where data authenticity is paramount for operational safety and security. The ability to fake data sources undermines trust in the entire system architecture and could lead to cascading failures in automated processes that depend on verified data inputs.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. Organizations should implement robust cryptographic signature validation mechanisms that verify all data sources against strong digital signatures using approved algorithms such as RSA with sufficient key lengths or ECDSA. The system should enforce strict signature verification before any data processing occurs and maintain comprehensive audit trails of signature validation results. Additionally, implementing proper key management practices including secure key generation, storage, and rotation procedures is essential to prevent unauthorized signature creation. Organizations should also consider deploying intrusion detection systems to monitor for suspicious signature validation patterns and establish regular security assessments to identify similar vulnerabilities in related components. This vulnerability demonstrates the critical importance of cryptographic implementation security as outlined in NIST SP 800-57 guidelines and aligns with ATT&CK technique T1556 for credential access through forged authentication mechanisms.