CVE-2026-19630
Description
A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending specially crafted Domain Name System (DNS) protocol messages containing an excessive number of specific structures. Because BIND does not impose a limit on processing these structures, handling the malicious request consumes disproportionate amounts of CPU time and memory, resulting in a Denial of Service (DoS).
Statement
This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker can exhaust server CPU and memory resources without requiring privileges, resulting in a denial of service. In Red Hat Enterprise Linux and OpenShift environments, the risk primarily affects BIND instances functioning as recursive resolvers exposed to untrusted traffic. Deployments serving strictly authoritative roles or those isolated from untrusted client queries experience significantly lower exposure to this attack vector.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
