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projectdiscovery/nuclei

Nuclei is a fast, customizable vulnerability scanner powered by the global security community and built on a simple YAML-based DSL, enabling collaboration to tackle trending vulnerabilities on the internet. It helps you find vulnerabilities in your applications, APIs, networks, DNS, and cloud configurations. · Go · 572 source files

Analyzed at 265b3a3dec on 2026-08-15. 280 documented errors.

Code / Message	Type	Severity	Tags
Invalid protocol type	validation	error	go, nuclei, yaml, templates, protocol-type, validation
mysql handshake filler byte is not zero	exception	warning	mysql, fingerprinting, protocol-parsing, network
invalid base ip	validation	error	randomip, cidr, dsl, validation
oracle	exception	error	oracle, dsn, sandbox, file-access
unsupported goexec method	validation	error	goexec, remote-execution, code-protocol, validation
packet length mismatch: header=	exception	warning	mssql, tds, protocol-parsing, fingerprint, network, go
' ' is not a valid extract type	validation	error	protocol, validation, template, cli-flags
failed to transform input for protocol	console	error	flow, input, transform, websocket, targets
authentication failed	exception	error	go, nuclei, telnet, network, authentication
could not upload results got status code	http	error	go, nuclei, pdcp, cloud-upload, http, authentication
invalid PL option data range	exception	warning	mssql, tds, protocol-parsing, fingerprint, bounds-check, network
the file for payload does not exist or does not contain…	validation	error	payloads, generator, file-not-found, template, compile-time
missing PL option terminator	exception	warning	mssql, tds, protocol-parsing, fingerprint, terminator, network
Invalid action type	validation	error	headless, yaml, enum, template, validation
unsupported goexec output method	validation	error	goexec, remote-execution, code-protocol, validation
invalid workflow with no templates or tags	validation	warning	go, nuclei, yaml, workflows, templates, validation
invalid goexec method arguments	validation	error	json, validation, wmi, goexec, javascript
interactsh client not initialized	error_code	warning	interactsh, oob, callback, configuration
dialers not initialized for	exception	error	oracle, runtime-initialization, configuration, network
target denied by network policy	exception	error	goexec, network-policy, security, configuration
open pipe	exception	error	dcerpc, smb, named-pipes, windows, network
aws s3 bucket details are missing. Please provide	validation	error	go, nuclei, aws-s3, configuration, cli, templates-distribution
unresolved DSL placeholders must be inside string literals	exception	error	matcher, dsl, placeholders, template, runtime
first PL option must be VERSION	exception	warning	mssql, tds, protocol-parsing, fingerprint, spec-violation, network
include directive preprocessing is disabled	validation	error	go, nuclei, yaml, templates, configuration, cli
matcher has unexpected fields	validation	error	matcher, validation, template, yaml, compile-time
no credentials provided	validation	error	go, nuclei, pdcp, cloud-upload, authentication, nil-check
empty mysql greeting	exception	warning	mysql, protocol-parsing, fingerprint, empty-response, network, go
failed to load templates	exception	error	go, nuclei, templates, auth-secrets, lazy-loading
no fuzz values specified	validation	error	fuzz, yaml, template, dast, config
[ ] invalid request id ' ' provided	console	error	flow, request-id, template, selector
failed to store flow runtime errors got	console	warning	flow, error-handling, race, shutdown
truncated PL option token	exception	warning	mssql, tds, protocol-parsing, fingerprint, truncated-response, network
failed to write all bytes	exception	error	network, partial-write, timeout, tcp
VERSION option too short	exception	warning	mssql, tds, protocol-parsing, fingerprint, bounds-check, network
could not parse hexdump	console	warning	hexdump, output-formatting, binary, terminal
no PL option tokens	exception	warning	mssql, tds, protocol-parsing, fingerprint, empty-response, network
could not create flow executor	exception	error	flow, executor, template, version-skew
could not parse profile YAML	validation	error	go, nuclei, yaml, configuration, profile
not a oracle service	exception	warning	oracle, service-detection, network
unresolved variables with values found	console	error	template, variables, request-building, validation
dialers with executionId	panic	critical	panic, dialers, input-provider, sdk, scan-all-ips
goimpacket: refusing to dial	exception	error	network, go, smb, security, dialer
invalid attack type	validation	error	fuzzing, payloads, template, validation
waiting for password prompt	exception	error	telnet, network, authentication, timeout
invalid request type	validation	error	flow, protocol-dispatch, template, validation
proxy denied by network policy	exception	error	goexec, network-policy, proxy
can't get example for array item: %+v	exception	warning	openapi, schema, example-generation, recursion
could not rebuild request URL	exception	error	http, redirect, url-parsing, client
no records found	exception	warning	dns, dsl, runtime, template, matcher
unresolved variables found	console	error	template, variables, dsl, validation
path is outside nuclei-template directory and…	validation	error	filesystem, sandbox, security, krbforge, javascript, kerberos
smb connect	exception	error	network, smb, dcerpc, javascript, authentication
prompt not found (read cap reached)	exception	error	go, nuclei, telnet, network, timeouts, configuration
unsupported input mode	validation	error	cli, input-mode, internal, defensive-code
validation failed for these fields	validation	error	go, nuclei, yaml, validation, templates
failed to evaluate expression	exception	error	expressions, dsl, variables, template, runtime
post-auth read: (got: )	exception	error	telnet, network, authentication, io-error
response too short for TDS header	exception	warning	mssql, protocol, tds, parser, internal
: invalid TDS packet length	exception	warning	mssql, protocol, tds, fingerprinting, service-detection
cookie reuse enabled but cookie-jar is nil	exception	error	headless, sdk, cookies, contextargs
failed to compile expression	exception	error	expressions, dsl, template, runtime, govaluate
could not compile flow	validation	error	flow, javascript, template, syntax, validation
tree listing exceeded max entries	exception	warning	smb, javascript, nuclei, resource-limits
invalid string offset	exception	warning	mysql, fingerprinting, truncated-response, network
dialers not initialized for execution id	panic	critical	panic, http, dialers, client-pool, sdk
max sleep count	exception	error	headless, browser, retry, resources, docker
mysql handshake packet length out of range	exception	warning	mysql, protocol-parsing, fingerprint, packet-length, network, go
mysql handshake missing filler byte	exception	warning	mysql, protocol-parsing, fingerprint, bounds-check, network, go
object can be a key:value or a string	validation	error	json, fuzz, parsing, template, payloads
no extracted values found for template	exception	error	go, nuclei, auth-secrets, extractors, templates
unresolved DSL placeholder	exception	error	matcher, dsl, placeholders, template, runtime
mysql error packet truncated	exception	warning	mysql, protocol-parsing, fingerprint, packet-length, truncated-response, go
unsupported mysql protocol version	exception	warning	mysql, protocol-parsing, fingerprint, version-mismatch, network, go
cannot use IP address as DNS input	validation	error	dns, input-validation, template, ip-address
regex extractor group must be >= 0, got	validation	error	extractor, regex, template, compile-time, validation
nuclei js runtime: program failed to terminate after…	exception	error	javascript, goja, timeout, hang, runtime
empty input provided for fuzzing	validation	error	fuzzing, http, input-validation, sdk
azure connection details are missing. Please provide	validation	error	go, nuclei, azure, configuration, cli, templates-distribution
could not create temp secrets file	exception	error	go, nuclei, filesystem, permissions, file-descriptors, concurrency
encountered invalid ASCII character	exception	warning	mysql, fingerprinting, tls, protocol-parsing
not a mssql service	exception	warning	mssql, service-detection, javascript, nuclei-template, go
could not find any templates with tech tag	console	warning	automatic-scan, tech-detect, templates, configuration
for given input	exception	error	runner, automatic-scan, templates, setup, runtime
invalid connection string	validation	error	postgres, go, database, dsn, url-parsing
invalid host or port	validation	error	mysql, input-validation, dsn
unterminated mysql string	exception	warning	mysql, fingerprinting, truncated-response, network
dcerpc bind	exception	error	dcerpc, authentication, kerberos, ntlm, smb
mysql packet too short	exception	warning	mysql, protocol-parsing, fingerprint, truncated-response, go
unknown extractor type specified	validation	error	extractor, template, compile-time, yaml, validation
mysql error packet has invalid header	exception	info	mysql, protocol-parsing, fingerprint, defensive-check, go
NTLM response too short: need at least 48 bytes, got	exception	warning	telnet, ntlm, malformed-data, bounds-check, network-protocol
could not create temp directory	exception	error	go, nuclei, filesystem, configuration, tmpdir, permissions
invalid dns type	validation	error	nuclei, dsl, dns, template, validation
%w: %v	exception	warning	mssql, protocol, tds, fingerprinting, service-detection
waiting for login/username prompt	exception	error	telnet, auth, timeout, prompt-matching, network-protocol
batteringram must have single payload set	validation	error	fuzzing, payloads, generators, validation
failed to download spec from url	exception	error	network, input, openapi, swagger, download
failed to parse NTLM response	exception	error	telnet, javascript, nuclei, ntlm, parsing
failed to send encryption packet	exception	error	telnet, network, connection-reset, timeout, firewall