CVE-2020-25739

Publication date 23 September 2020

Last updated 26 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.1 · Medium

Score breakdown

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

Package Ubuntu Release Status
ruby-gon 26.04 LTS resolute Not in release
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 Ignored end of standard support, was needed
14.04 LTS trusty Not in release

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.1 · Medium

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

Other references

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