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SAST
Tools that read your source code without ever running it.
What it means
SAST stands for static application security testing. These tools read your source code without running it, following how data travels from where it enters to where you use it.
Because they read everything, they reach paths a tester never will: the feature behind a flag, the error branch, the monthly batch job.
Why it matters
Coverage is the argument for static analysis, and it is a real one. It runs fast, and it sits where fixes cost least, next to the change that caused the problem.
The limitation is just as real. Reading code tells you a dangerous pattern exists, not that anyone can reach it. A flagged line behind a check the tool could not follow is not a vulnerability. A queue full of those teaches a team to ignore the tool. Point it at code your own people write. For imported libraries, composition analysis answers faster.
How it shows up
You feel the weakness in triage. The list runs long and one pattern repeats across a hundred files. The argument in the room is whether any of it is exploitable, rather than how to fix it.
Pair breadth with proof. Use static analysis to find candidates, then confirm the ones that matter by reaching them in the running application, so an engineer receives something demonstrated. Tuning helps too. Switch off the rules your team already decided not to act on, and people will read what remains. Put the output where developers work, too. A finding in a pull request gets read, and the same finding in a separate dashboard usually does not.
Questions people ask
SAST, answered
What is the difference between SAST and DAST?
Static testing reads the code without running it. Dynamic testing attacks the running application from outside.
Static analysis sees every path and proves none of them. Dynamic testing proves what it reaches and misses what it cannot reach.
Why does SAST report so many false positives?
Because it has to assume a path is reachable whenever it cannot prove otherwise. The tool still reports a flagged line sitting behind a check it could not follow.
The cost is not the alert. It is the team learning to scroll past the list.
Should a small team buy SAST or DAST first?
It depends on where your risk sits. If most of it lives in code your own team writes, start static. If you run an internet facing application and want to know what an outsider reaches, start dynamic.
Neither answers the other's question, which is why most teams end up running both.
Does SAST find business logic flaws?
Rarely. A price a customer can change or an approval step somebody can skip looks like ordinary code, because it is ordinary code.
Cyberlop tests ten vulnerability classes today and business logic is not one of them. That module ships on 4 January 2027.
Can SAST take the place of a penetration test?
No. It finds candidates, and a test confirms which of them somebody can actually reach. A report full of unreached candidates is what engineers and buyers both discount.
Cyberlop reads code to know where to look, then sends the request. A confirmed-only mode, which hides everything it has not demonstrated, ships on 19 October 2026.
Sources
Where this comes from
Related
Terms that sit next to this one
DAST
Tools that attack a running application from the outside.
IAST
An agent inside a running app that watches where input travels.
White-box testing
Testing with access to the source code, not just the running application.
False positive
A reported issue that turns out not to be real.
SCA
Checking your libraries against databases of published vulnerabilities.
Tired of arguing about exploitability?
Cyberlop reads your code to know where to look, then sends the request that proves it, so an engineer receives something demonstrated. Talk to us about your application.
Or start with a $199 pilot on one application: thirty days, success criteria agreed before day one, credited against the annual if you convert.