Improper Input Validation in alilibaba:fastjson

published 2018-10-23 8 y ago modified 2026-06-17 4 mo ago also GHSA-xjrr-xv9m-4pw5 , EUVD-2018-0715

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 38.8%; EPSS 38.8% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known, plus a Nuclei check

parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pippo 1.11.0 and other products, allows remote attackers to execute arbitrary code via a crafted JSON request, as demonstrated by a crafted rmi:// URI in the dataSourceName field of HTTP POST data to the Pippo /json URI, which is mishandled in AjaxApplication.java.

Patch / fix

fixed in 3 links 1

maven com.alibaba:fastjson 1.2.31
maven ro.pippo:pippo-fastjson 1.12.0
alibaba fastjson 1.2.25

github.com/pippo-java/pippo@8443377 commit

Exploit prediction

38.84% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Fastjson Insecure Deserialization - Remote Code Execution nuclei detection template
github.com https://github.com/pippo-java/pippo/issues/466 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C
GitHub	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	com.alibaba:fastjson	<1.2.31	1.2.31
maven	ro.pippo:pippo-fastjson	<1.12.0	1.12.0

Classification

Weakness

CWE-20 Improper Input Validation

References

github.com /pippo-java/pippo/commit/8443377d3c5b35acca190a66894b4f95e4051be2
web
github.com /pippo-java/pippo/issues/466
web, exploit, third-party-advisory
fortiguard.com /encyclopedia/ips/44059
web, mitigation, third-party-advisory
github.com /alibaba/fastjson/wiki/security_update_20170315
web, mitigation, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2017-18349
advisory
github.com /advisories/GHSA-xjrr-xv9m-4pw5
advisory
github.com /alibaba/fastjson
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary