CVE-2026-11932: IBM Security Verify Access DoS Vulnerability

CVE-2026-11932 Overview

CVE-2026-11932 is a denial of service vulnerability affecting IBM Security Verify Access and IBM Verify Identity Access. The flaw is tracked under CWE-835, which covers loops with unreachable exit conditions (infinite loop). A remote, unauthenticated attacker can send crafted network traffic that consumes availability of the affected service. Impacted versions include IBM Security Verify Access 10.0 through 10.0.9.2, IBM Verify Identity Access 11.0 through 11.0.3, and IBM Verify Identity Access Container 11.0 through 11.0.3. IBM published details in the IBM Support advisory.

Critical Impact
A remote attacker without credentials can trigger a denial of service condition against identity and access management infrastructure, disrupting authentication for downstream applications.

Affected Products

IBM Security Verify Access 10.0 through 10.0.9.2
IBM Verify Identity Access 11.0 through 11.0.3
IBM Verify Identity Access Container 11.0 through 11.0.3

Discovery Timeline

2026-08-12 - CVE-2026-11932 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-11932

Vulnerability Analysis

CVE-2026-11932 is a denial of service condition in IBM's identity access management stack. The weakness is classified as [CWE-835], indicating a loop that lacks a proper exit condition. When processing certain network input, the affected component enters a state where iteration continues without terminating. This exhausts CPU or thread resources, degrading or halting the service.

The vulnerability affects only availability. Confidentiality and integrity of data handled by the appliance are not impacted. However, because IBM Security Verify Access and Verify Identity Access act as authentication and policy enforcement points, an outage cascades into any application that depends on them for single sign-on, federation, or access decisions.

Root Cause

The root cause is an infinite loop [CWE-835] in the request handling logic of the affected IBM products. Input that fails to satisfy the loop's exit condition causes the process to iterate indefinitely, consuming compute resources without returning a response. Refer to the IBM Support advisory for vendor technical details.

Attack Vector

Exploitation requires network access to the affected service. No authentication or user interaction is needed. An attacker sends a specifically formed request to the exposed endpoint of an affected Verify Access or Verify Identity Access instance. Successful exploitation causes resource exhaustion and denial of service for legitimate users. No public proof of concept or exploit code has been observed at time of publication.

Detection Methods for CVE-2026-11932

Indicators of Compromise

Sustained high CPU utilization on IBM Security Verify Access or Verify Identity Access instances without a corresponding increase in legitimate traffic volume
Worker threads or processes that stop responding to health checks while the parent service remains running
Repeated inbound requests from a small set of source addresses immediately preceding service degradation

Detection Strategies

Monitor process-level CPU and thread counts on Verify Access and Verify Identity Access nodes for anomalies compared to a baseline
Review reverse proxy and load balancer logs for requests that never receive a backend response
Correlate spikes in unanswered authentication requests with upstream network traffic patterns

Monitoring Recommendations

Enable verbose request logging on WebSEAL and runtime components to capture the request paths preceding service hangs
Configure alerts on authentication latency and error rates from dependent applications
Track container restart events for Verify Identity Access Container deployments

How to Mitigate CVE-2026-11932

Immediate Actions Required

Inventory all IBM Security Verify Access 10.0.x, Verify Identity Access 11.0.x, and Verify Identity Access Container 11.0.x deployments
Apply the fixed version identified in the IBM Support advisory
Restrict network access to management and runtime endpoints to trusted sources where feasible
Ensure high availability configurations are healthy so a single-node outage does not remove authentication capability

Patch Information

IBM has published remediation guidance on the IBM Support page for this advisory. Administrators should upgrade beyond IBM Security Verify Access 10.0.9.2 and Verify Identity Access 11.0.3, or apply the specific fix pack referenced by IBM for their deployment channel.

Workarounds

Place the affected service behind a web application firewall or reverse proxy that enforces request timeouts and rate limits
Configure process supervisors to detect hung worker threads and restart them automatically
Reduce internet exposure of Verify Access endpoints that are only required by internal identity flows

bash

# Example: enforce request timeout and rate limit at an NGINX reverse proxy
proxy_read_timeout 15s;
proxy_send_timeout 15s;
limit_req_zone $binary_remote_addr zone=verify:10m rate=20r/s;

server {
    listen 443 ssl;
    server_name verify.example.com;

    location / {
        limit_req zone=verify burst=40 nodelay;
        proxy_pass https://verify-access-backend;
    }
}