Patch generation is the creation of code changes intended to fix a security flaw. In practice, it means turning a vulnerability report, proof of concept, or failed test into a concrete repair: a code edit, configuration change, dependency update, or mitigation that closes the weakness without breaking the system.
It matters because finding a flaw is only half the job. Defenders need patches that are correct, minimal, and safe to deploy, especially in large codebases or fast release cycles. Automated patch generation can speed triage and remediation, but it still needs human review to catch regressions, missed edge cases, or incomplete fixes. Attackers also care about patches: once a fix is public, they can study it to understand the original flaw and target unpatched systems. For that reason, patch generation sits at the center of both defensive response and offensive reverse engineering.