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CVE-2026-42491 is a transport security flaw in the Xen Project XAPI SDKs affecting the C# and PowerShell language bindings. While the primary RPC connection to the XAPI host performs certificate verification correctly or delegates verification appropriately, certain SDK HTTP handlers establish separate connections for secondary operations and fail to implement TLS certificate verification correctly on those connections. This creates a man-in-the-middle exposure for traffic exchanged during those secondary HTTP operations. An attacker positioned between software built on the affected SDKs and an XAPI host can intercept and modify data transmitted over those connections, including material associated with administrative sessions and data transfer workflows.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.