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Remote code execution in Kramdown

High severity GitHub Reviewed Published Mar 29, 2021 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

bundler kramdown (RubyGems)

Affected versions

>= 1.16.0, < 2.3.1

Patched versions

2.3.1

Description

Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.

References

Published by the National Vulnerability Database Mar 19, 2021
Reviewed Mar 22, 2021
Published to the GitHub Advisory Database Mar 29, 2021
Last updated Feb 1, 2023

Severity

High

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(80th percentile)

Weaknesses

Improper Control of Generation of Code ('Code Injection')

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Learn more on MITRE.

CVE ID

CVE-2021-28834

GHSA ID

GHSA-52p9-v744-mwjj

Source code

No known source code
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