A security release is a software update that fixes one or more security vulnerabilities or reduces their risk. It may include code changes, dependency updates, or configuration adjustments, and is often published for specific supported software versions.
Security releases matter because unpatched flaws can expose systems to attacks such as data theft, service disruption, or remote code execution. In practice, defenders identify affected versions, install the appropriate update, and verify that production servers, containers, build pipelines, and bundled runtimes are updated. Rebuilding and redeploying applications may be necessary when they include their own copy of a vulnerable component.