IBM Verify Access CVE-2026-11937

Exploitation requires three concurrent conditions: (1) the target instance must be running the Reverse Proxy component in a specific non-default configuration described by IBM - the exact triggering configuration is not disclosed in the available CVE data, meaning administrators must consult the IBM advisory to identify whether their deployment is susceptible; (2) the attacker must possess at least low-level authenticated access to the system (PR:L per CVSS vector), ruling out unauthenticated remote exploitation; and (3) high attack complexity (AC:H) implies specific timing, concurrency, or state conditions must be satisfied, making casual or automated exploitation unreliable. Impact is strictly bounded to denial of service against the Reverse Proxy; no confidentiality or integrity exploitation is possible via this vector.

The real-world risk is low. The CVSS base score of 3.1 is accurately calibrated: network reachability (AV:N) is offset by a high attack complexity requirement (AC:H), a low-privilege authentication prerequisite (PR:L), and impact confined to partial availability degradation (A:L) with no confidentiality or integrity loss. No EPSS score was provided and the vulnerability does not appear in the CISA KEV catalog, indicating it has not been observed in active exploitation campaigns. The 'certain configurations' qualifier materially narrows the exploitable population - organizations running the Reverse Proxy in its default posture are likely not at risk. No proof-of-concept code has been identified. This vulnerability is best characterized as a low-priority operational availability issue rather than a strategic security risk, but IAM infrastructure disruption can have outsized downstream effects on authenticated access to protected resources.

An authenticated user with low-level credentials - such as a service account provisioned for a protected application - submits a specially crafted HTTP request to the IBM Verify Access Reverse Proxy running in the susceptible configuration. The Use After Free condition in the proxy's memory management code is triggered under the specific state conditions required by AC:H, causing the Reverse Proxy process to crash or become unresponsive and denying service to downstream users dependent on it for access to protected resources. No public proof-of-concept code exists at time of analysis.