Code Security

Static analysis
that reasons about intent

AI-native analysis across 16 languages that catches the business-logic flaws signatures miss, then hands you a validated, merge-ready fix.

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Code review3 findings

IDOR · /api/orders/:idReachable

SSRF · webhooks.tsReachable

SQL pattern · test fixturenot reachable

Fewer pattern hits, with the logic flaws first

What reaches your teamShare of raw findingsCheck

Nullify

validated

Reasoning pass

plausible

Signature-based SAST

matches a pattern

Illustrative example. Real ratios depend on your codebase.

16

languages, from Go and Java
to Rust, Solidity and Apex

3

open fix pull requests per repository
at most, so review stays manageable

Move from pattern matches
to flaws in how your app actually works

Reason

Understands how your app works

Traces untrusted input top-down from HTTP requests, API calls and file uploads, and bottom-up from dangerous sinks back to their sources.

checkout-service · orders.ts

orders.ts:18 GET /api/orders/:id → findOrder(id)

No ownership check between the caller and the order · IDOR

webhooks.ts:41 fetch(req.body.callbackUrl)

Untrusted URL reaches a server-side request · SSRF

Validation

✓Reachable. Called from a public route.

validation · IDOR /api/orders/:id

reachable · public route ✓
exploitable · any signed-in user ✓
confirmed · high business impact

Validate

Checked before it's reported

Each finding is validated on reachability, exploitability and business context, so your queue holds real issues instead of pattern hits.

From a suspicious handler to a merged fix

Each step narrows the list. What reaches an engineer is a confirmed flaw with a tested fix attached, routed to the person who owns the code.

01

Read

02

Reason

03

Validate

04

Fix opened

A minimal root-cause fix, validated against your build and opened as a pull request for the code owner.

ConfirmedIDOR · GET /api/orders/:id

Code owner @m.alvarez · from CODEOWNERS

- return findOrder(id)
+ return findOrder(id, { ownerId: user.id })

Validated against the buildMerge-ready

Flaws get caught on the pull request, not in production

Nullify scans every pull request and every commit to the default branch. A confirmed flaw arrives with its fix, and your team still approves every merge.

Nullify · code review

→ PR #219 in acme/checkout · 4 files changed
→ tracing req.params.id … reaches findOrder() · no ownership check

Slack · #appsec

Nullify10:42 AM

Confirmed IDOR in checkout-service. Fix pull request opened for @m.alvarez.

Pull request · code review

Openacme/checkout #219

Add order lookup endpoint

nullify reviewed this PR

Any signed-in user can read another user's orders. The suggested change scopes the lookup to the caller.

reachableexploitablefix suggested

›_ src/orders.ts+1 −1

17  router.get('/api/orders/:id', auth, async (req, res) => {
18  - res.json(await findOrder(req.params.id))
18  + res.json(await findOrder(req.params.id, { ownerId: req.user.id }))
    # ↑ IDOR · reachable from a public route

Signature-based SAST says this matches a pattern, while Nullify shows you how it breaks your app

Trace the data flow

Nullify follows untrusted input to the sink and checks whether the caller should be allowed through.

Validate reachability

Score business context

Ship the fix

Findings · checkout-serviceValidating

FindingReachablePriorityFix

IDOR · orders.tsyes✓ firstPR open

SSRF · webhooks.tsyes✓ highPR open

SQL pattern · fixtures/seed.tsnolow—

Deserialization · queue.tstesting…——

Works with

One review for code flaws and leaked secrets

PR #219 · code review
→ candidate secret in config/prod.yaml
→ AWS key · authenticated · live

Secrets Detection

Hardcoded credentials caught in the same review, then checked against the real provider.

Triage queue

✓ IDOR · ranked first

Unreachable SQL pattern · suppressed

Triage & Remediation

Prioritize by reachability and impact, then ship merge-ready fixes.

FAQ

Questions teams ask about code security

Code review docs · Secrets Detection · Triage & Remediation · Exploit Validation

How is this different from the SAST scanner we already run?

+

Traditional SAST matches signatures and hands your team alerts. Nullify reasons about how your application behaves, which is why it catches logic flaws like IDOR and broken access control that have no signature — and instead of an alert, the output is a validated, merge-ready fix.

Which languages and frameworks are supported?

+

Sixteen languages, with framework-aware analysis — Spring and Jakarta EE for Java, Django, Flask and FastAPI for Python, Rails for Ruby, Node, Express and Next.js for JavaScript and TypeScript, Laravel for PHP, Axum and Actix for Rust including unsafe-block analysis, and more. The full list lives in the docs.

What happens when it finds something?

+

The finding is validated and scored against your business context, then remediated: Nullify writes a minimal root-cause fix, validates it against the build, opens a pull request routed to the right owner, and manages it through CI and review until your team merges it.

Will it flood our developers with pull requests?

+

No. Throughput is deliberately capped at three open Nullify fix pull requests per repository and five per remediation plan, so developers receive a bounded queue of evidence-backed, merge-ready changes to review.

Scoped honestly

Your team still approves every merge

Nullify finds the flaw, validates it and opens a fix tested against your build. It never merges on its own, and it keeps at most three open fix pull requests per repository, so review stays manageable.

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