# CVE-2017-18349: Improper Input Validation in alilibaba:fastjson

Source: https://junglewise.ai/threats/cve-2017-18349-improper-input-validation-in-alilibaba-fastjson  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2018-10-24  
License: CC BY 4.0 with a link back

CVE-2017-18349 · Severity: low · CVSS 3 · Published 2018-10-24

Improper Input Validation in alilibaba:fastjson

Technologies: [com.alibaba:fastjson (Maven)](https://junglewise.ai/threats/technologies/com-alibaba-fastjson). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2017-18349 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2017-18349 being exploited in the wild.

**How severe is CVE-2017-18349?** Low severity, with a CVSS score of 3, published 24 October 2018.

**Which products and versions are affected?** com.alibaba:fastjson (Maven) ECOSYSTEM:introduced=0,fixed=1.2.31; ro.pippo:pippo-fastjson (Maven) ECOSYSTEM:introduced=0,fixed=1.12.0.

**Is there a fix for CVE-2017-18349?** Yes. com.alibaba:fastjson (Maven): upgrade to 1.2.31 or later; ro.pippo:pippo-fastjson (Maven): upgrade to 1.12.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2017-18349?** Check whether you run com.alibaba:fastjson (Maven) or ro.pippo:pippo-fastjson (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- com.alibaba:fastjson (Maven): upgrade to 1.2.31 or later

  ```sh
  # set com.alibaba:fastjson to 1.2.31 in your pom.xml or build.gradle
  ```

- ro.pippo:pippo-fastjson (Maven): upgrade to 1.12.0 or later

  ```sh
  # set ro.pippo:pippo-fastjson to 1.12.0 in your pom.xml or build.gradle
  ```


## Affected products

- com.alibaba:fastjson (Maven) ECOSYSTEM:introduced=0,fixed=1.2.31
- ro.pippo:pippo-fastjson (Maven) ECOSYSTEM:introduced=0,fixed=1.12.0

## Identifiers

- CVE-2017-18349
- GHSA-xjrr-xv9m-4pw5

## Related threats

- [Alibaba fastjson remote code execution in Spring Boot fat-jar deployments](https://junglewise.ai/threats/cve-2026-16723-alibaba-fastjson-remote-code-execution-in-spring-boot-fat-jar)
- [Alibaba Fastjson remote code execution via autoType JNDI injection](https://junglewise.ai/threats/cve-2025-70974-alibaba-fastjson-remote-code-execution-via-autotype-jndi)
- [Unsafe deserialization in com.alibaba:fastjson](https://junglewise.ai/threats/cve-2022-25845-unsafe-deserialization-in-com-alibaba-fastjson)