CVE-2026-91249 in Solaris
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Libraries). The supported version that is affected is 11.4. Easily exploitable vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Solaris accessible data. CVSS 3.1 Base Score 3.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Libraries component of Oracle Solaris version 11.4, representing a security flaw that impacts system confidentiality rather than integrity or availability. This issue is classified under CWE-200 as an Information Exposure vulnerability, where sensitive data becomes accessible to unauthorized entities due to improper access control mechanisms within the library functions. The technical nature of this flaw suggests that specific internal APIs or shared libraries fail to adequately restrict read operations on certain memory regions or system files when invoked by processes with lower privilege levels. This architectural weakness allows a user account with standard, low-privileged credentials to trigger code paths that bypass expected security boundaries, resulting in the leakage of data that should remain isolated from untrusted users.
From an operational perspective, the exploitability profile indicates that this vulnerability requires local access and does not necessitate any form of social engineering or user interaction. An attacker must already have a valid logon to the infrastructure running Oracle Solaris 11.4, which aligns with the ATT&CK technique T1078 Valid Accounts. Once authenticated, the low complexity of the attack vector means that exploitation is straightforward and does not require sophisticated payload construction or specific timing conditions. The primary impact is limited to unauthorized read access against a subset of accessible data, meaning while an attacker cannot modify system configurations or execute arbitrary code directly through this flaw, they can potentially extract sensitive information such as configuration details, user credentials hashes, or other proprietary data stored in the affected memory space.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 3.3, categorized as Low severity due to its confinement to confidentiality impacts and the requirement for local authentication. This scoring reflects the limited scope of damage compared to remote code execution or privilege escalation vulnerabilities. However, in environments where defense-in-depth strategies are critical, even low-severity local information disclosure can serve as a stepping stone for further attacks if combined with other weaknesses such as weak password policies or additional lateral movement capabilities. The lack of impact on integrity and availability ensures that system stability remains intact during exploitation, but the breach of confidentiality undermines trust in data handling procedures within the operating system environment.
Mitigation strategies should prioritize applying the latest security patches provided by Oracle for Solaris 11.4 to address the underlying library flaw directly at its source. In scenarios where immediate patching is not feasible due to operational constraints or testing requirements, administrators should enforce strict least-privilege principles across all user accounts and service processes running on the affected systems. This includes auditing which users have access to sensitive directories and ensuring that no unnecessary local accounts exist with elevated permissions. Additionally, implementing robust monitoring solutions can help detect anomalous read patterns from low-privileged accounts targeting system libraries or protected data stores, providing an early warning indicator of potential exploitation attempts in real-time environments.