# a1phaboy/FastjsonScan

Fastjson扫描器，可识别版本、依赖库、autoType状态等。A tool to distinguish fastjson ,version and dependency

Repository: https://github.com/a1phaboy/FastjsonScan
Canonical: https://ross.abutalabs.com/products/fastjsonscan
Language: Go
License: MIT
License Family: permissive
Topics: deserialization-vulnerability, fastjson, fastjson-rce, scanner-web
Last push: 2022-10-07T18:08:55+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 1458, "days_push": 1426, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1055, forks 94 (observed 2026-08-28T04:03:24.398575+00:00)

## What it is
FastjsonScan is a Go-based command-line scanner that detects Fastjson deserialization vulnerabilities in Java web services. It identifies the Fastjson version, AutoType status, and dependency libraries through error-based, DNS, and delay-based probing techniques.

## Use cases
- detect fastjson deserialization vulnerabilities in a web app
- identify fastjson version of a target endpoint
- check if autotype is enabled on a java service
- batch scan a list of urls for fastjson rce
- detect dependency libraries via dnslog probing
- find fastjson versions vulnerable to rce

## When to choose
- you need an actively maintained fastjson scanner covering versions up to 1.2.83
- you want batch URL scanning with error, DNS, and delay detection
- you need AutoType status and dependency library detection in one tool

## When to avoid
- you need to scan JSON libraries other than fastjson, jackson, gson, or org.json
- you require automated exploitation rather than detection
- you need scanning in restricted intranet environments without DNS egress

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: vulnerability-scanning, security, http-client, cli
- domain: security, penetration-testing, developer-tools
- platform: windows, cli, go
- tags: fastjson, deserialization-vulnerability, java-security, scanner, pentest, linux, macos

## Member repositories
- a1phaboy/FastjsonScan (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:24.398575+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:58:28.738858+00:00, confidence not recorded.
  - readme: https://github.com/a1phaboy/FastjsonScan (fetched 2026-08-28T04:03:24.398575+00:00, sha e29fd8e7b5d8)
- Data as of 2026-08-30T08:39:29.467469+00:00.