CVE-2026-42502 is a vulnerability in the golang.org/x/net/html package affecting how HTML elements in foreign content (such as SVG or MathML) are handled. Incorrect parsing behaviour could potentially be exploited to bypass security controls or cause unintended application behaviour in Go-based services. This is relevant to Azure workloads and any cloud-hosted applications built with Go that rely on this HTML parsing library.

Architect’s Take: Audit your Azure-hosted Go applications and container images for dependencies on golang.org/x/net/html and update to the patched version immediately. Pay particular attention to services that parse or render user-supplied HTML, as these carry the highest risk of exploitation.

Original advisory: CVE-2026-42502 Invoking incorrect handling of HTML elements in foreign content in golang.org/x/net/html