Resource exhaustion in resolv - CVE-2026-80212
Published: August 27, 2026
Vulnerability identifier: #VU145888
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80212
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the resolv DNS resolution logic when processing malicious DNS responses from an attacker-controlled name server. A remote attacker can return crafted DNS responses that are retained permanently to cause a denial of service.
Only applications that resolve hostnames an attacker can influence through this gem are affected.
Affected software
resolv
How to mitigate CVE-2026-80212
Install security update from vendor's website.
resolv - addressed in versions 0.3.2, 0.7.2