resolv up to 0.2.2/0.3.0/0.6.1 on Ruby resource consumption

Summaryinfo

A vulnerability labeled as problematic has been found in resolv up to 0.2.2/0.3.0/0.6.1 on Ruby. Impacted is an unknown function. The manipulation results in resource consumption. This vulnerability is known as CVE-2025-24294. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in resolv up to 0.2.2/0.3.0/0.6.1 on Ruby. Affected is an unknown part. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at ruby-lang.org. This vulnerability is traded as CVE-2025-24294 since 01/17/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 243497 (Amazon Linux 2023 : ruby3.2, ruby3.2-bundled-gems, ruby3.2-default-gems (ALAS2023-2025-1131)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (243497), EUVD (EUVD-2025-21202) and CERT Bund (WID-SEC-2025-1472). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Open Source Ruby

Productinfo

Type

• Ruby Gem

Name

• resolv

Version

• 0.1
• 0.2
• 0.2.0
• 0.2.1
• 0.2.2
• 0.3.0
• 0.6.0
• 0.6.1

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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