CVE-2026-91252 in Solaris
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Services). The supported version that is affected is 11.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Solaris. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Solaris and unauthorized read access to a subset of Oracle Solaris accessible data. CVSS 3.1 Base Score 8.2 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Services component of Oracle Solaris version 11.4, representing a critical security flaw that undermines the integrity and availability of the operating system environment. This specific weakness is characterized by its high exploitability, as it requires no authentication from the attacker and can be leveraged over network access via the HTTP protocol. The presence of this vulnerability indicates a fundamental failure in how the service handles incoming requests or processes data within the web-facing interface, allowing external actors to interact with the system without prior credentials. This lack of required authentication significantly lowers the barrier for entry, enabling any remote entity with connectivity to attempt exploitation against the targeted Solaris instance.
From a technical perspective, the flaw manifests in two distinct but related impact vectors: denial of service and unauthorized data access. The primary operational consequence is the ability to cause a hang or induce a frequently repeatable crash, effectively resulting in a complete denial of service condition for Oracle Solaris services. This instability suggests that maliciously crafted HTTP requests can exhaust system resources such as memory or CPU cycles, or trigger unhandled exceptions within the application logic, leading to process termination or kernel panic states. Concurrently, the vulnerability permits unauthorized read access to a subset of accessible data on the host machine. While this does not allow for immediate modification or execution of code, it exposes sensitive information that may include configuration details, user data, or internal system states, thereby compromising confidentiality alongside availability.
The severity of this issue is quantified by a CVSS 3.1 Base Score of 8.2, classified as High Severity. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H) highlights that the attack vector is network-based with low complexity and no prerequisites for user interaction or privileges. The impact assessment reveals a Low level of Confidentiality compromise but a High level of Availability compromise, indicating that while data leakage is possible, the most immediate and damaging effect is the disruption of service continuity. This aligns closely with CWE-20 Improper Input Validation, as the root cause likely involves insufficient sanitization or validation of HTTP request parameters before processing. Furthermore, in terms of adversary tactics, this vulnerability facilitates actions consistent with ATT&CK technique T1499 Endpoint Denial of Service and potentially T1530 Data from Local System, depending on the specific data exfiltrated through the read access flaw.
Mitigation strategies must focus on immediate isolation and patching to restore security posture. Organizations running Oracle Solaris 11.4 should apply the latest vendor-supplied patches that address this specific service component vulnerability as a priority action. In scenarios where patching is not immediately feasible, network-level controls such as firewall rules or web application firewalls can be configured to restrict HTTP access to trusted IP ranges only, thereby reducing the attack surface exposed to unauthenticated remote attackers. Additionally, implementing strict input validation at the proxy level and monitoring for anomalous traffic patterns indicative of denial-of-service attempts can provide a layer of defense-in-depth. Regular security audits and vulnerability scans should also be conducted to ensure no other related weaknesses exist within the same service module that could be chained with this flaw for more severe outcomes.