CVE-2026-13761 Overview
CVE-2026-13761 affects Pega Platform versions 7.1.0 through 25.1.2. The vulnerability stems from improper validation of inputs used for loop conditions [CWE-606]. Attackers can trigger excessive looping, leading to denial of service or other consequences on affected Pega Platform instances.
The flaw is remotely exploitable over the network without authentication or user interaction. Pega has published guidance in the Pega Security Advisory N26 to help customers remediate the issue across supported releases.
Critical Impact
Unauthenticated remote attackers can send crafted inputs that force the platform into excessive loop execution, degrading integrity and availability of Pega Platform services.
Affected Products
- Pega Platform 7.1.0 through 8.x releases
- Pega Platform 23.x and 24.x releases
- Pega Platform 25.1.0 through 25.1.2
Discovery Timeline
- 2026-08-28 - CVE-2026-13761 published to the National Vulnerability Database
- 2026-08-28 - Last updated in NVD database
Technical Details for CVE-2026-13761
Vulnerability Analysis
The vulnerability is classified under [CWE-606: Unchecked Input for Loop Condition]. Pega Platform accepts input from network requests and uses that input, directly or indirectly, to control loop iteration counts or termination conditions. The platform does not enforce upper bounds or validate the input against expected ranges before entering the loop.
When an attacker supplies a value that produces an extremely large iteration count, the affected code path continues execution far beyond intended limits. This consumes CPU cycles, memory, and worker threads on the Pega application server. Sustained requests exhaust available resources and cause service degradation or outright denial of service for legitimate users.
The CVSS 4.0 vector indicates high impact to integrity and availability of the vulnerable system, with subsequent low impact to availability of downstream systems. Because the attack requires no privileges or user interaction, any exposed Pega Platform endpoint reachable over the network is at risk.
Root Cause
The root cause is missing input validation on parameters that influence loop control. Pega Platform code paths trust caller-supplied values to bound iteration counts. Without a sanity check against a maximum threshold, adversary-controlled inputs propagate directly into loop conditions.
Attack Vector
An unauthenticated attacker sends a crafted HTTP request to a network-exposed Pega Platform endpoint. The request contains a parameter that expands the loop iteration count to an excessive value. The server processes the loop until resources are exhausted or a timeout terminates the request. Repeated requests amplify the effect across worker threads.
See the Pega Security Advisory N26 for vendor technical details.
Detection Methods for CVE-2026-13761
Indicators of Compromise
- Sustained spikes in CPU utilization or thread pool saturation on Pega Platform application servers without a corresponding increase in legitimate user activity.
- Repeated HTTP requests from a small set of source addresses targeting the same Pega endpoint with anomalously large numeric parameter values.
- Application server timeouts, request queue backlogs, or worker thread exhaustion logged in Pega server logs.
Detection Strategies
- Baseline normal request processing times for Pega endpoints and alert on requests that exceed the baseline by an order of magnitude.
- Inspect web application firewall logs for input parameters with numeric values outside expected ranges bound for Pega application URLs.
- Correlate application server resource metrics with inbound request patterns to identify low-volume, high-cost request signatures.
Monitoring Recommendations
- Forward Pega Platform application, access, and error logs to a centralized analytics platform for continuous review.
- Monitor JVM metrics including thread count, heap usage, and garbage collection frequency on Pega nodes.
- Track HTTP response time percentiles per endpoint and alert on sustained degradation.
How to Mitigate CVE-2026-13761
Immediate Actions Required
- Review the Pega Security Advisory N26 and identify the fixed release that applies to your deployed Pega Platform version.
- Apply the vendor-supplied remediation to all Pega Platform instances running versions 7.1.0 through 25.1.2.
- Restrict network access to Pega Platform administrative and API endpoints to trusted networks until patching completes.
Patch Information
Pega Systems has published remediation guidance in Pega Security Advisory N26. Customers should consult the advisory for the specific hotfix or upgrade path corresponding to their currently deployed version and apply the recommended update.
Workarounds
- Deploy a web application firewall rule that rejects requests to Pega endpoints when numeric parameters exceed defined maximum values.
- Enforce per-source rate limiting on Pega Platform endpoints to reduce the impact of repeated malicious requests.
- Configure application server request timeouts to cap the maximum execution time for any single request against Pega Platform.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
