CVE-2026-109839 in Db2 Genius Hub
Summary
by MITRE • 10/16/2026
IBM Db2 Genius Hub 1.0 could allow a remote authenticated attacker to bypass security restrictions due to a missing initialization vector in the cryptographic algorithm.
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified within IBM Db2 Genius Hub version 1.0 represents a critical failure in the implementation of symmetric encryption protocols, specifically stemming from the omission or reuse of an Initialization Vector during cryptographic operations. In standard block cipher modes such as Cipher Block Chaining or Counter mode, the initialization vector serves to ensure that identical plaintext blocks encrypt into different ciphertext blocks, thereby preventing pattern recognition and ensuring semantic security. The absence of a proper initialization vector fundamentally compromises this property, leading to deterministic encryption where the same input always produces the same output. This flaw allows an attacker who has valid authentication credentials for the application to exploit predictable cryptographic outputs to infer sensitive data or manipulate encrypted payloads without possessing the decryption key.
From a technical perspective, this issue aligns with CWE-329, which describes the use of a known initialization vector in CBC mode, and more broadly with CWE-14 regarding compiler removal of security-critical code if the missing IV was inadvertently stripped during optimization or configuration errors. The core mechanism failure lies in the cryptographic library's handling of stateful encryption processes. When an initialization vector is not generated randomly for each encryption operation, the resulting ciphertext leaks information about the plaintext structure. For instance, if two users submit identical sensitive data fields that are encrypted using this flawed algorithm, their stored database entries will appear identical at the byte level. This lack of diffusion enables attackers to perform statistical analysis or dictionary attacks against the encrypted data with significantly reduced computational effort compared to standard brute-force methods.
The operational impact of this vulnerability is severe for organizations relying on IBM Db2 Genius Hub for secure data management and analytics. Since the exploit requires remote authenticated access, it targets users who have already bypassed initial perimeter defenses through valid credentials. Once inside, an attacker can leverage the deterministic nature of the encryption to perform traffic analysis or database fingerprinting. By observing patterns in encrypted fields such as usernames, email addresses, or financial identifiers, the adversary can correlate records across different tables or time periods. This capability facilitates unauthorized data aggregation and profiling, potentially leading to significant privacy violations under regulations like GDPR or HIPAA. Furthermore, if session tokens or authentication cookies are stored using this flawed encryption scheme, an attacker could predict valid sessions for other users by analyzing previously captured encrypted values, thereby escalating privileges beyond their assigned role.
Mitigation strategies must address both the immediate technical flaw and broader security posture improvements. The primary remediation involves upgrading to a patched version of IBM Db2 Genius Hub where the cryptographic module has been corrected to generate unique, cryptographically secure random initialization vectors for every encryption operation. Until an update is applied, administrators should enforce strict access controls using multi-factor authentication to limit the pool of potential attackers who can authenticate remotely. Additionally, implementing network segmentation and deep packet inspection can help detect anomalous patterns in encrypted traffic that may indicate exploitation attempts. It is also advisable to review application code for any custom cryptographic implementations that might replicate this error, ensuring compliance with NIST SP 800-132 guidelines for secure key derivation and encryption practices. Long-term resilience requires adopting a zero-trust architecture where no authenticated user is implicitly trusted, combined with regular security audits focused on cryptography implementation details to prevent similar misconfigurations in future deployments.