[BUG] Panic: invalid memory address or nil pointer dereference using ThreadSafeNucleiEngine with NoHostErrors = true

[maxwolf8852]

Is there an existing issue for this?

• I have searched the existing issues.

Current Behavior

If i use ThreadSafeNucleiEngine with option e.Options().NoHostErrors = true leads to internal panic in hosterrorscache.(*Cache).Check function when accessing to uninitialised failedTargets inside Cache struct.

Expected Behavior

No panic.

Steps To Reproduce

func withNoHostErrors(e *nuclei.NucleiEngine) error {
	e.Options().NoHostErrors = true
	return nil
}

func main() {
	options := []nuclei.NucleiSDKOptions{
		withNoHostErrors,
	}
	ne, err := nuclei.NewThreadSafeNucleiEngineCtx(context.TODO(), options...)
	if err != nil {
		errExit(err)
	}

	if err := ne.GlobalLoadAllTemplates(); err != nil {
		errExit(err)
	}

	ne.GlobalResultCallback(func(event *output.ResultEvent) {
		fmt.Println(event.Host, event.Info.SeverityHolder.Severity)
	})

	if err := ne.ExecuteNucleiWithOptsCtx(context.TODO(), []string{"scanme.nmap.org"}); err != nil {
		errExit(err)
	}
}

func errExit(err error) {
	fmt.Println(err)
	os.Exit(1)
}

Relevant log output

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x10 pc=0x1019d5148]

goroutine 39805 [running]:
github.com/projectdiscovery/nuclei/v3/pkg/protocols/common/hosterrorscache.(*Cache).Check(0x0, {0x106cece20?, 0x0?}, 0x0?)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/protocols/common/hosterrorscache/hosterrorscache.go:132 +0x48
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateWithTargets.func3(0x14013262600)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/executors.go:153 +0x468
github.com/projectdiscovery/nuclei/v3/pkg/input/provider.(*SimpleInputProvider).Iterate(0x14037e02010?, 0x1402d18ca00)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/input/provider/simple.go:38 +0x60
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateWithTargets(0x1400f599800, {0x1050d6980, 0x106cece20}, 0x14024c94588, {0x1050e48b0, 0x14013c77d40}, 0x14007a2b358)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/executors.go:123 +0x3ec
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateSpray.func1(0x140255f5cc0?)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/execute_options.go:136 +0x5c
created by github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateSpray in goroutine 1
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/execute_options.go:131 +0x8c
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x10 pc=0x1019d5148]

goroutine 39799 [running]:
github.com/projectdiscovery/nuclei/v3/pkg/protocols/common/hosterrorscache.(*Cache).Check(0x0, {0x106cece20?, 0x0?}, 0x0?)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/protocols/common/hosterrorscache/hosterrorscache.go:132 +0x48
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateWithTargets.func3(0x14013262600)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/executors.go:153 +0x468
github.com/projectdiscovery/nuclei/v3/pkg/input/provider.(*SimpleInputProvider).Iterate(0x1401af5e010?, 0x1402d162a00)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/input/provider/simple.go:38 +0x60
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateWithTargets(0x1400f599800, {0x1050d6980, 0x106cece20}, 0x1402499a848, {0x1050e48b0, 0x14013c77d40}, 0x14007a2b358)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/executors.go:123 +0x3ec
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateSpray.func1(0x14025626820?)
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/execute_options.go:136 +0x5c
created by github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateSpray in goroutine 1
        /Users/***/go/pkg/mod/github.com/projectdiscovery/nuclei/v3@v3.7.0/pkg/core/execute_options.go:131 +0x8c
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x10 pc=0x1019d5148]

Environment

- OS: MacOS 15.7.3
- Nuclei: v3.7.0
- Go: 1.25.0

Anything else?

No response

[maxwolf8852]

However, if I add this option only to ExecuteNucleiWithOptsCtx (not to NewThreadSafeNucleiEngineCtx), no panic occurs.