CVE-2025-24294 Affecting ruby2.5 package, versions <2.5.1-1ubuntu1.16+esm5


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.02% (4th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UBUNTU1804-RUBY25-10769098
  • published5 Sept 2025
  • disclosed12 Jul 2025

Introduced: 12 Jul 2025

CVE-2025-24294  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 ruby2.5 to version 2.5.1-1ubuntu1.16+esm5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby2.5 package and not the ruby2.5 package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.

An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.

This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.

CVSS Base Scores

version 3.1