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XAPI SDK CVE-2026-42491

CRITICAL
2026-07-14
Information Disclosure Suse
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Severity by source

vuln.today AI
7.4 HIGH

Network MitM required (AV:N, AC:H); no privileges needed on target; high confidentiality and integrity impact via session hijack and data tampering; no availability impact described.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 16:16 vuln.today
CVE Published
Jul 14, 2026 - 16:14 oss-security
CRITICAL

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Missing TLS certificate validation in the XAPI C

and PowerShell SDK bindings - specifically on secondary HTTP handler connections used for disk image transfers, host backups, RRD data, and patch delivery - allows a network-positioned attacker to intercept communications between third-party management tools and Xen hypervisor hosts. Successful Man-in-the-Middle exploitation can yield stolen administrative session tokens, enabling full hypervisor session hijack, or permit tampering with critical data such as imported disk images and host update packages in transit. No public exploit code has been identified at time of analysis, and the Xen Project advisory XSA-498 confirms no known mitigations exist short of patching.

Technical ContextAI

XAPI (XenAPI) is the management API underpinning Xen-based hypervisor platforms including XenServer, Citrix Hypervisor, and XCP-ng. XAPI distributes language-binding SDKs allowing third-party tools to programmatically interact with managed hypervisor hosts. While the primary RPC connection in all SDK languages performs TLS verification correctly (or delegates it to the consumer), secondary HTTP handler connections - invoked for bulk data operations such as disk image export/import, host backups, RRD performance data retrieval, and patch/update deployment - lack proper certificate validation specifically in the C

and PowerShell bindings. The root cause is consistent with CWE-295 (Improper Certificate Validation) or CWE-297 (Improper Validation of Certificate with Host Mismatch), though no CWE is officially assigned in the advisory. Other XAPI language bindings are unaffected. No CPE strings were provided in the available data.

Affected ProductsAI

The XAPI C

and PowerShell SDK bindings are affected from the point at which TLS support was introduced into those bindings; no specific version numbers or ranges are identified in the advisory. All third-party applications compiled against these vulnerable SDK versions and making use of the affected secondary HTTP handler connections are vulnerable, regardless of which XAPI host version they connect to. Other XAPI language bindings (e.g., Python, Java) are explicitly not affected. The advisory is published as Xen Security Advisory XSA-498 and is available at https://seclists.org/oss-sec/2026/q3/142. No CPE identifiers were provided in the available intelligence data.

RemediationAI

Apply the official patch xsa498.patch to the XAPI master branch (SHA-256: f2db9e16561edc59b920e0ed95cce3a19147abc6eb2b8500bd73b87dc285d4ba), referenced at https://seclists.org/oss-sec/2026/q3/142. Critically, patching the XAPI host alone is insufficient - third-party programs that bundle or distribute their own copies of the XAPI C

or PowerShell SDK bindings must be rebuilt against the fixed SDK and redistributed to consumers. The Xen Project advisory states explicitly that no known mitigations exist. As compensating controls pending patch deployment, organizations should enforce strict network segmentation on XAPI management interfaces, restrict which hosts can initiate management-plane connections, and apply IPsec or mutual-authentication overlays on management VLANs where feasible; note these reduce but do not eliminate risk from compromised internal hosts or privileged insiders. Audit all internal tooling and automation for use of the XAPI C

or PowerShell SDK to assess exposure scope.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected
SUSE Linux Enterprise Micro 5.4 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected

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CVE-2026-42491 vulnerability details – vuln.today
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