CVE-2020-25739

Publication date 23 September 2020

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An issue was discovered in the gon gem before gon-6.4.0 for Ruby. MultiJson does not honor the escape_mode parameter to escape fields as an XSS protection mechanism. To mitigate, json_dumper.rb in gon now does escaping for XSS by default without relying on MultiJson.

From the Ubuntu Security Team

It was discovered that Gon gem did not properly escape certain input. An attacker could use this vulnerability to execute a cross-site scripting (XSS) attack.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ruby-gon	25.10 questing	Not in release
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Fixed 6.1.0-1+deb9u1build0.18.04.1
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Not in release

Severity score breakdown

Parameter	Value
Base score	6.1 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-4560-1
Gon gem vulnerability
30 September 2020