Denial of Service Vulnerability in Ruby's Resolv Library
CVE-2025-24294

7.5HIGH

Key Information:

Vendor

Ruby

Status
Resolv
Vendor
CVE Published:
12 July 2025

What is CVE-2025-24294?

A vulnerability exists in the Resolv library used by Ruby, enabling attackers to exploit the system through crafted DNS packets. When these packets contain a highly compressed domain name, the parsing process incurs excessive CPU usage. This occurs because the library fails to impose proper limits on the length of decompressed names. As a result, potentially any application relying on this parsing could experience significant resource drainage, rendering it unresponsive and leading to a Denial of Service condition.

Affected Version(s)

resolv 0.2 <= 0.2.2

resolv 0.3.0

resolv 0.6 <= 0.6.1

References

https://www.ruby-lang.org/en/news/2025/07/08/dos-resolv-c...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-24294 : Denial of Service Vulnerability in Ruby's Resolv Library