CVE-2025-24294 Affecting ruby3.3 package, versions <3.3.8-2ubuntu2


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.09% (26th percentile)

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  • Snyk IDSNYK-UBUNTU2510-RUBY33-15020262
  • published17 Jan 2026
  • disclosed12 Jul 2025

Introduced: 12 Jul 2025

CVE-2025-24294  (opens in a new tab)

How to fix?

Upgrade Ubuntu:25.10 ruby3.3 to version 3.3.8-2ubuntu2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby3.3 package and not the ruby3.3 package as distributed by Ubuntu. See How to fix? for Ubuntu:25.10 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