Executive Summary

IBM DataPower Gateway versions 10.5.x, 10.6.x, and 11.0.x are vulnerable to a race condition that allows improper isolation of request state when processing the built‑in X‑Client‑IP header. Under concurrent traffic, X‑Client‑IP values can bleed between requests, enabling attackers to spoof IP addresses and disclose other clients’ IPs. The flaw can be exploited without authentication and may facilitate lateral movement or data exfiltration. No CISA KEV listing yet.

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Authoritative CVE Metadata - CVSS Base Score: 4.2 (MEDIUM) - Published: 2026-08-12T22:17:17.780 - Last Modified: 2026-10-04T18:16:34.943

Original Description: IBM DataPower Gateway 11.0.0.0 through 11.0.0.1 and IBM DataPower Gateway 10.5.0.0 through 10.5.0.21 and IBM DataPower Gateway 10.6.0.0 through 10.6.0.9 allows a race condition that results in improper isolation of request state when handling the built‑in X‑Client‑IP header. Under concurrent request processing, X‑Client‑IP values may be contaminated across requests, enabling IP spoofing and disclosure of other clients’ IP addresses.

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