Resource exhaustion in Ruby Resolv
CVE-2025-24294
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.005 (42.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Ruby Resolv — versions 0.2, 0.3.0, 0.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-24294?
- CVE-2025-24294 is a high-severity vulnerability in Ruby Resolv, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2025-07-12.
- How severe is CVE-2025-24294?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-24294 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.