Container security started where it was easiest: scan the image. Before a container ships, you inventory its packages, match them against known-vulnerability databases, and block the ones that fail. It's necessary work, but it has a ceiling — an image scan is a point-in-time snapshot of what's installed, and it says nothing about how the container behaves once it's actually running in production.
The grant US10706145B2, "Runtime detection of vulnerabilities in software containers" (issued July 7, 2020, assigned to Twistlock, Ltd.), pushes detection past the build stage. Its CPC classifications cluster in the software-protection classes — G06F 21/554, G06F 21/51, G06F 21/52, G06F 21/53, G06F 21/564, G06F 21/566 — covering both vulnerability detection and the sandboxing and malware-detection mechanisms a runtime defense needs.
“A system and method for detecting vulnerabilities in software containers at runtime are provided.”— U.S. Patent No. 10,706,145 source
The mechanism that matters is the shift in vantage point. A running container reveals things a static image cannot: which processes actually spawn, what network connections open, which files get written. A vulnerability that's dormant in an image — a library that's only exploitable when a particular code path executes — becomes visible when that code path runs. Runtime detection watches for exactly that.
For defenders, the practical takeaway is that image scanning and runtime detection are complementary, not redundant. The image scan keeps known-bad components out; runtime detection catches what slips through, including the case where a clean image is compromised after deployment. In a world of ephemeral, fast-cycling containers, the running workload is where the real risk lives.
The engineering challenge the patent addresses is doing this without crushing performance — runtime monitoring has to be light enough not to negate the efficiency that made containers attractive in the first place. That balance, between visibility and overhead, is the recurring tension in all runtime security, and it's the reason the approach took real invention to make practical.