Medium [CVE-2026-81092] DNS Rebinding vulnerability due to missing Host header validation
This medium-severity Red Hat Linux advisory covers CVE-2026-81092 affecting Red Hat Connectivity Link 1, Red Hat Hardened Images, Red Hat OpenShift AI (RHOAI).
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Summary
A flaw was found in mcp-go. This component failed to validate the Host header in HTTP requests, specifically within its StreamableHTTPServer and SSEServer transports.
A remote attacker could exploit this by using a crafted web page to perform a DNS rebinding attack. This allows the attacker to direct a controlled domain name to the loopback address, bypassing local network restrictions.
Consequently, the attacker could access and interact with local services and resources, potentially leading to information disclosure or unauthorized actions. Red Hat severity: Moderate — CVSS 6.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N).
Weakness: CWE-918. Affected Red Hat products: Red Hat Connectivity Link 1; Red Hat Hardened Images; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift distributed tracing 3.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 0.56.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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