Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Unauthenticated TCP-reachable service (AV:N/AC:L/PR:N/UI:N) with complete DOS (A:H) and partial data read/modify (C:L/I:L), no scope change.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
Lifecycle Timeline
2DescriptionCVE.org
Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). The supported version that is affected is 15.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP to compromise Oracle Coherence. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Coherence as well as unauthorized update, insert or delete access to some of Oracle Coherence accessible data and unauthorized read access to a subset of Oracle Coherence accessible data. CVSS 3.1 Base Score 8.6 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H).
AnalysisAI
Denial-of-service with data tampering in Oracle Coherence 15.1.1.0.0 (Fusion Middleware Core) lets an unauthenticated network attacker hang or repeatedly crash the in-memory data grid over TCP, while also gaining limited unauthorized read and write access to a subset of grid-managed data. Rated CVSS 3.1 8.6 by Oracle and described as 'easily exploitable,' the flaw requires no authentication or user interaction. No public exploit has been identified at time of analysis, and it is not listed in CISA KEV.
Technical ContextAI
Oracle Coherence is Oracle's distributed in-memory data grid used within Fusion Middleware for caching, clustering, and low-latency data access; affected component is the Core. Cluster members and clients communicate over TCP (Coherence*Extend / TCMP), and this class of Oracle Coherence issue typically stems from processing of untrusted network traffic reaching a listening grid port. No CWE was assigned in the input, but the CVSS profile (A:H with partial C:L/I:L) and Oracle's 'complete DOS' language point to a resource-exhaustion / improper-input-handling defect in the network message processing path rather than a full memory-corruption RCE. The only CPE provided is cpe:2.3:a:oracle_corporation:oracle_coherence:*:*:*:*:*:*:*:*, which does not itself pin the affected version - Oracle's text specifies 15.1.1.0.0.
RemediationAI
Apply the fixes from the Oracle Critical Patch Update of July 2026 (https://www.oracle.com/security-alerts/cpujul2026.html); the input does not specify an exact patched build number, so Patch available per vendor advisory - obtain the precise patch for Coherence 15.1.1.0.0 from that CPU. Until patched, reduce exposure by restricting network access to Coherence TCP listener ports (Coherence*Extend proxy and TCMP cluster ports) using firewall/security-group rules so only trusted cluster members and application tiers can reach them, and place the grid behind network segmentation rather than any externally reachable interface. Where supported, enable Coherence transport security (TLS/SSL and client authentication on Extend proxies) to limit which clients can send traffic; the trade-off is added configuration and potential latency, and access-restriction controls can break clients that legitimately connect from newly-blocked network ranges, so validate cluster membership and client connectivity after changes.
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-46650
GHSA-gjjm-qhf9-7gmj