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How CVE-2026-60399 Works
CVE-2026-60399 is a vulnerability affecting Oracle GoldenGate’s Receiver Service Executable component. Oracle GoldenGate is a real‑time data integration and replication platform widely used in enterprise environments to move and transform data across heterogeneous databases. The Receiver Service is a critical part of the GoldenGate architecture – it listens for incoming replication traffic from Distribution Services over HTTP or HTTPS, accepts data paths, and processes metadata and transaction logs.
The flaw resides in the HTTP request handling logic of the Receiver Service Executable. A low‑privileged attacker with network access to the Receiver Service can craft and send a series of malformed or specially sequenced HTTP requests. The service fails to properly validate and sanitise these incoming requests, which triggers an anomalous execution path inside the process. Instead of gracefully rejecting the invalid input, the Receiver Service enters a resource‑consuming loop or deadlock condition.
Specifically, the vulnerability is classified as a resource consumption issue (CWE‑400). The affected code does not correctly control the allocation and maintenance of limited system resources – such as memory buffers, thread pools, or file descriptors – when processing certain HTTP payloads. By repeatedly sending the malicious requests, an attacker can force the Receiver Service to exhaust available resources. This leads to a progressive hang, where the process stops responding to legitimate traffic, or to a frequently repeatable crash, resulting in a complete denial of service (DoS) of the Oracle GoldenGate instance.
The attack is remotely exploitable over HTTP, requires no user interaction, and demands only low privileges (e.g., a valid but unprivileged network account that can reach the Receiver Service endpoint). The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, giving a base score of 6.5 (Medium). This reflects that the vulnerability does not compromise confidentiality or integrity – its entire impact is on availability. However, in production environments where GoldenGate is critical for data replication and high availability, a successful DoS attack can halt data synchronisation, causing cascading failures in dependent systems and potentially leading to significant business disruption.
The vulnerability affects all Oracle GoldenGate versions in the following branches: 19.1.0.0.0 through 19.30.0.0, 21.3 through 21.21, and 23.4 through 23.26.1. Oracle addressed this issue in the July 2026 Critical Patch Update (CPU), which provides patched versions for each affected branch. No public exploit code was available at the time of disclosure, but the attack is considered easy to execute given the low complexity and network accessibility.
DailyCVE Form:
Platform: Oracle GoldenGate
Version: 19.1.0.0.0‑19.30.0.0, 21.3‑21.21, 23.4‑23.26.1
Vulnerability: Denial of Service (Resource Consumption)
Severity: Medium (CVSS 6.5)
Date: 2026‑07‑21
Prediction: 2026‑07‑21 (Oracle CPU July 2026)
What Undercode Say:
Analytics from threat intelligence and vendor advisories indicate active attacker interest in this vulnerability due to the ease of exploitation and the potential to disrupt critical replication pipelines. The following commands and scripts can be used to assess exposure and simulate the attack in a controlled lab environment.
Check GoldenGate version and Receiver Service status:
Check installed GoldenGate version $GG_HOME/ggsci << EOF INFO ALL VERSION EOF Verify Receiver Service is running and listening on HTTP port netstat -tulpn | grep -E ":(80|8080|9000)" | grep receiver
Simulate a malformed HTTP request to test service resilience (educational use only):
Send a crafted POST request with oversized or malformed JSON payload
curl -X POST http://<receiver-ip>:<port>/service/path \
-H "Content-Type: application/json" \
-d '{"malformed": "'$(python3 -c 'print("A"1000000)')'"}'
Repeatedly send the request in a loop to trigger resource exhaustion
while true; do
curl -s -X POST http://<receiver-ip>:<port>/service/path \
-H "Content-Type: application/json" \
-d '{"payload": "'$(head -c 50000 /dev/urandom | base64 -w0)'"}' &
sleep 0.1
done
Monitor GoldenGate process health and resource usage:
Watch Receiver Service process ID and memory consumption watch -n 1 'ps aux | grep receiver | grep -v grep' Check GoldenGate log for crash or hang indicators tail -f $GG_HOME/ggserr.log | grep -i "receiver|crash|hang|timeout"
Exploit:
As of the disclosure date (July 2026), no public exploit code has been released. However, the vulnerability is easily exploitable over the network with low privileges. An attacker would need only to identify an exposed Receiver Service HTTP endpoint and send a sequence of specially crafted requests that trigger the resource‑consumption path. The attack does not require authentication if the Receiver Service is misconfigured to allow unauthenticated access, but even with low‑privileged credentials, the impact is the same – a complete DoS of the GoldenGate Receiver, halting all inbound replication traffic.
Protection:
- Apply the July 2026 Oracle Critical Patch Update (CPU) immediately. Upgrade to the fixed versions: for the 19.x branch, upgrade to 19.30.0.0 or later; for 21.x, upgrade to 21.22 or later; for 23.x, upgrade to 23.26.2 or later. All patched versions are available via Oracle’s support portal.
- Restrict network access to the Receiver Service HTTP port using firewall rules or network ACLs. Allow connections only from trusted Distribution Service endpoints and administrative networks.
- Enable HTTP authentication and mutual TLS (mTLS) for the Receiver Service to ensure that only authenticated and authorised clients can send requests.
- Deploy rate‑limiting and request‑size restrictions at the reverse proxy or load balancer level to mitigate bulk malformed‑request attacks.
- Monitor GoldenGate logs for unusual HTTP error patterns or repeated connection resets, and set up alerting for Receiver Service restarts or hangs.
Impact:
Successful exploitation results in a complete denial of service of the Oracle GoldenGate Receiver Service. This prevents the ingestion of replicated data from source systems, causing replication lag, data inconsistency, and potential loss of transactional integrity. In mission‑critical environments, this can lead to application downtime, failed failovers, and extended recovery windows. Since the vulnerability does not affect confidentiality or integrity, no data breach or corruption occurs – but the availability impact is severe enough to warrant immediate patching.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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