Bug 2379684 (CVE-2025-24294)

Summary: CVE-2025-24294 resolv: Denial of Service in resolv gem
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jvasik, kaycoth, lchilton, rblanco, sfeifer, vmugicag, zdohnal
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A denial of service flaw was found in resolv ruby gem. This flaw allows an attacker to craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses this packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.
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Description OSIDB Bzimport 2025-07-12 04:01:16 UTC 
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.