CVE-2026-60403: Oracle TimesTen In-Memory Database DoS Flaw

CVE-2026-60403 Overview

CVE-2026-60403 affects the Kubernetes Operator component of Oracle TimesTen In-Memory Database version 26.1.1.1.0. The vulnerability allows a low-privileged attacker with network access via HTTPS to trigger a hang or repeatable crash of the database. Successful exploitation results in a complete denial of service (DoS) of the TimesTen In-Memory Database instance. The flaw is easily exploitable and requires no user interaction. Oracle disclosed the issue as part of its July 2026 Critical Patch Update cycle.

Critical Impact
Authenticated attackers with low privileges can remotely crash or hang Oracle TimesTen In-Memory Database instances, causing full availability loss to database-dependent services.

Affected Products

Oracle TimesTen In-Memory Database 26.1.1.1.0
Component: Kubernetes Operator
Deployments exposing the operator over HTTPS to authenticated users

Discovery Timeline

2026-07-21 - CVE-2026-60403 published to NVD
2026-07-23 - Last updated in NVD database

Technical Details for CVE-2026-60403

Vulnerability Analysis

The vulnerability resides in the Kubernetes Operator component that manages Oracle TimesTen In-Memory Database deployments within Kubernetes clusters. A low-privileged authenticated attacker can send crafted HTTPS requests to the operator to force the database into a hang state or produce a repeatable crash. The attack targets availability exclusively, with no impact to confidentiality or integrity. The vulnerability is network-reachable, requires low attack complexity, and does not need user interaction. The EPSS score is 0.289% at the 21.061 percentile, indicating a low probability of exploitation in the near term.

Root Cause

Oracle has not published detailed root-cause information beyond the July 2026 Critical Patch Update advisory. The flaw is categorized as a Denial of Service condition reachable through the Kubernetes Operator's network interface. It permits authenticated low-privilege callers to disrupt the database service lifecycle managed by the operator.

Attack Vector

An attacker with authenticated access to the Kubernetes cluster or the exposed operator API sends malicious HTTPS requests to the Kubernetes Operator endpoint. The request triggers a hang or a repeatable crash, halting database operations. Because the attack repeats reliably, restart cycles alone do not restore service until the malicious traffic is blocked. Refer to the Oracle Security Alert July 2026 for vendor guidance.

Detection Methods for CVE-2026-60403

Indicators of Compromise

Repeated unexpected pod restarts or CrashLoopBackOff states for TimesTen operator-managed pods
Unresponsive TimesTen database instances following authenticated HTTPS traffic to the operator API
Kubernetes audit log entries showing anomalous API calls from low-privileged service accounts targeting the TimesTen Operator

Detection Strategies

Monitor Kubernetes audit logs for unusual API request patterns to TimesTen Operator custom resources
Track database availability metrics and correlate outages with recent operator API activity
Alert on service account activity that deviates from established baselines for interacting with the operator

Monitoring Recommendations

Enable verbose logging on the TimesTen Kubernetes Operator and forward logs to a centralized SIEM
Configure liveness and readiness probes with alerting on repeated failure states
Review RBAC bindings periodically to ensure only required identities can invoke operator APIs

How to Mitigate CVE-2026-60403

Immediate Actions Required

Apply the Oracle July 2026 Critical Patch Update for TimesTen In-Memory Database as soon as possible
Restrict network access to the Kubernetes Operator API to trusted management networks only
Audit and reduce RBAC permissions granted to service accounts and users that can reach the operator

Patch Information

Oracle addressed CVE-2026-60403 in the July 2026 Critical Patch Update. Administrators running Oracle TimesTen In-Memory Database 26.1.1.1.0 should follow the remediation instructions in the Oracle Security Alert July 2026.

Workarounds

Apply Kubernetes NetworkPolicies to limit inbound HTTPS traffic to the TimesTen Operator namespace
Enforce least-privilege RBAC to prevent low-privileged accounts from invoking operator resources
Isolate TimesTen Operator workloads on dedicated nodes with restricted ingress

bash

# Example NetworkPolicy restricting operator access
kubectl apply -f - <<EOF
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: restrict-timesten-operator
  namespace: timesten-operator
spec:
  podSelector:
    matchLabels:
      app: timesten-operator
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          role: trusted-admin
    ports:
    - protocol: TCP
      port: 8443
EOF