Serverless changed the attack surface: no host to protect, but every function is a tiny privileged identity with its own code, dependencies, and permissions and there are thousands of them. Security shifted to least-privilege function roles, code and dependency scanning, and runtime behaviour.
Palo Alto and Aqua lead, Snyk owns the code layer, and the honest headline is that standalone serverless security has largely folded into CNAPP. Here are the ten best and where the category actually lives now.
The Decision Matrix
| If this describes you | Choose | Why |
| Buying CNAPP, want serverless in it | Palo Alto (Prisma Cloud) | Deepest serverless within the platform |
| Function-and-container lifecycle | Aqua Security | Strong FaaS across build-to-run |
| Code and dependency risk is the fear | Snyk | Best dependency/code scanning |
| Runtime function behaviour | Sysdig | eBPF-adjacent runtime, cloud context |
| Check Point estate | Check Point CloudGuard | Serverless-scanning heritage |
| Context-first agentless | Wiz | Graph correlation incl. functions |
| Observability-led (already Datadog) | Datadog | Security atop the platform you run |
| App-layer / IAST runtime defence | Contrast Security | In-app instrumentation for functions/apps |
| Anomaly-led, Fortinet estate | Fortinet (Lacework) | Behavioural baselines |
| Unified telemetry | Uptycs | One data model incl. serverless |
Definitional answer: serverless security protects function-as-a-service workloads (Lambda, Azure Functions, Cloud Functions) through least-privilege function permissions, code and dependency vulnerability scanning, configuration posture, and runtime behavioural monitoring since there is no host to harden.
What Actually Changed
The function’s permissions are the perimeter. A Lambda with an over-broad execution role is the serverless equivalent of an over-privileged server and there are thousands of functions accumulating roles. This is where serverless security and CIEM converge, and it’s the single highest-value control.
Dependencies are the dominant code risk. Functions are mostly glue plus libraries; a vulnerable dependency in a function is exploitable in production. Dependency scanning (Snyk’s core strength) matters more here than in almost any other workload type.
There’s no runtime host so runtime means behaviour. You can’t install an agent on a function the way you do a server. Serverless runtime security watches invocation behaviour, network calls, and anomalies through cloud-provider integration rather than a host sensor.
The category consolidated hard. Several early serverless-security pure-plays were acquired or absorbed; standalone serverless security is now mostly a CNAPP capability. Buy it where your cloud security already lives unless you have a specific app-layer need.
The 10 Best, Briefly
1. Palo Alto (Prisma Cloud) — best in a platform
Prisma Cloud delivers the deepest serverless security available inside a unified platform, integrating function permission analysis, dependency scanning, and runtime protection directly into leading Cloud-Native Application Protection Platforms (CNAPPs).
Wins: platform breadth; strong function-permission and runtime coverage.
Strains: credit modelling; platform commitment.
Image ALT: Prisma Cloud serverless protection2. Aqua Security — best lifecycle
Aqua provides end-to-end security spanning code scanning, least-privilege role recommendations, and runtime protection across FaaS and containerized workloads, setting the standard for runtime vulnerability management and workload protection.
Wins: lifecycle coverage; function permission right-sizing; OSS adjacency.
Strains: breadth beyond cloud-native thinner.
Image ALT: Aqua serverless function security3. Snyk — best code and dependency layer
Snyk provides the developer-first dependency and code-scanning layer that serverless functions critically require, standing out in evaluations of software composition analysis (SCA) and Snyk alternatives by delivering actionable remediation advice directly inside CI/CD pipelines.
Wins: best dependency scanning; developer adoption.
Strains: not runtime or permission-focused pair for full coverage.
Image ALT: Snyk serverless dependency scanning4. Sysdig — best runtime behaviour
Runtime and cloud-context detection extended to serverless invocation behaviour, with the Falco open-source lineage and eBPF cloud runtime capture analysis behind it.
Wins: runtime behaviour depth; cloud context.
Strains: function-permission tooling lighter than Prisma/Aqua.
Image ALT: Sysdig serverless runtime behaviour5. Check Point CloudGuard — best serverless-scanning heritage
Long-standing serverless-security capability (the Protego lineage) function posture, least privilege, and automated remediation of cloud misconfigurations and over-permissive roles within CloudGuard.
Wins: serverless heritage; least-privilege focus; platform integration.
Strains: best value inside Check Point.
Image ALT: CloudGuard serverless posture6. Wiz — best context-first
Serverless findings on the security graph, correlating function permissions and dependency risk with the wider cloud attack surface on the Wiz cloud security architecture.
Wins: correlation; agentless visibility.
Strains: runtime depth for functions maturing; premium.
Image ALT: Wiz serverless on graph7. Datadog — best observability-led
If Datadog already runs your observability, its security modules extend to serverless with strong tracing context backed by telemetry from researchers investigating credential spray campaigns against AWS accounts.
Wins: observability integration; serverless tracing.
Strains: standalone security buyers price it against dedicated tools.
Image ALT: Datadog serverless security tracing8. Contrast Security — best app-layer runtime (IAST)
In-application instrumentation (IAST/RASP) that protects function and application code from within mirroring the advantages of Interactive Application Security Testing (IAST) by watching execution paths live.
Wins: app-layer runtime defence; low false positives via instrumentation.
Strains: instrumentation model differs; not a cloud-posture tool.
Image ALT: Contrast IAST in-function instrumentation9. Fortinet (Lacework) — best anomaly-led
Polygraph behavioural baselines applied to serverless activity, integrated into Fortinet’s Security Fabric and FortiCNAPP cloud detection frameworks.
Wins: anomaly detection; Fortinet-estate value.
Strains: integration-era naming; confirm scope.
Image ALT: Lacework serverless anomaly10. Uptycs — best unified telemetry
osquery/eBPF telemetry model extended toward serverless, delivering unified visibility backed by threat research identifying malware and multi-platform cloud attacks.
Wins: unified telemetry.
Strains: serverless depth trails specialists; packaging polish.
Image ALT: Uptycs serverless telemetryBuyer’s Guide
Right-size function permissions first. The over-privileged execution role is the serverless crown-jewel risk.
Tools that analyze and recommend least-privilege function roles (Prisma, Aqua, CloudGuard) deliver the highest-value control this is CIEM for functions.
Scan dependencies in CI. Functions live and die by their libraries; a vulnerable dependency is exploitable in production. Snyk-class scanning in the pipeline is table stakes.
Accept that runtime means cloud-integration, not agents. You protect functions through provider integration and behavioural analysis, not host sensors. Confirm the tool’s provider coverage (Lambda, Azure Functions, Cloud Functions) is genuine.
Buy it where your cloud security lives. Standalone serverless security rarely makes sense now it’s a CNAPP capability. The exceptions are app-layer IAST (Contrast) and observability-led (Datadog) needs.
Common mistakes: ignoring function permissions while scanning code; assuming “no host” means “no attack surface”; buying standalone serverless tools the CNAPP already covers; and skipping provider-coverage verification.
Frequently Asked Questions
What is serverless security?
Serverless security protects function-as-a-service workloads (AWS Lambda, Azure Functions, Google Cloud Functions) through least-privilege function permissions, code and dependency vulnerability scanning, configuration posture, and runtime behavioural monitoring since there is no host operating system to harden.
What is the best serverless security solution in 2026?
Palo Alto (Prisma Cloud) and Aqua lead within CNAPP platforms; Snyk owns the code/dependency layer; Check Point CloudGuard carries strong serverless-scanning heritage; Contrast offers app-layer IAST. Most buyers get serverless security inside the CNAPP they already run.
Do functions really have an attack surface?
Yes. Each function is a privileged identity with its own code, dependencies, and execution role. Over-broad permissions, vulnerable dependencies, and malicious invocation behaviour are all exploitable “no host to patch” does not mean “nothing to secure.”
Why do function permissions matter most?
An over-privileged function execution role lets a compromised function reach far more than it should the serverless version of an over-privileged server. With thousands of functions accumulating roles, least-privilege function permissions (CIEM for functions) is the highest-value serverless control.
Do I need a standalone serverless tool?
Rarely. The category has largely folded into CNAPP Prisma, Aqua, Wiz, and others include serverless. Standalone needs are mainly app-layer IAST (Contrast) or observability-led (Datadog). Buy serverless security where your cloud security already lives.
How much does serverless security cost?
Per function, per invocation volume, or bundled into CNAPP pricing; observability-led options price within their platforms. Model function counts and invocation volume, and treat serverless as a CNAPP capability rather than a separate line unless you have a specific app-layer requirement.
The Verdict
Serverless didn’t remove the attack surface it fragmented it into thousands of tiny privileged functions.
Right-size function permissions (this is CIEM for functions), scan dependencies in CI, and watch runtime behaviour through provider integration. Buy it inside your CNAPP Prisma, Aqua, Wiz unless you specifically need Snyk’s code depth, Contrast’s app-layer IAST, or Datadog’s observability integration.
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