CVE-2026-80274
Description
A flaw was found in BIND. A remote attacker, by sending a specially crafted DNSSEC-signed authoritative zone reply, can trigger an unexpected program exit in the validating resolver. This can lead to a Denial of Service (DoS) for the affected BIND resolver.
Statement
This is an Important denial of service vulnerability in BIND resolvers. When DNSSEC validation is enabled, a specially crafted DNSSEC reply from an authoritative server can cause the BIND resolver to unexpectedly exit, leading to a disruption of DNS resolution services. This impacts the availability of DNS resolution on affected Red Hat systems configured with DNSSEC.
Mitigation
To mitigate this issue, disable DNSSEC validation in the BIND resolver configuration. This can be achieved by setting `dnssec-enable no;` and `dnssec-validation no;` within the `options` block in `named.conf` or an included configuration file. A restart of the `named` service is required for the changes to take effect and may impact DNS resolution during the restart. Disabling DNSSEC validation will reduce the security posture of DNS resolution by removing integrity protection for DNS data.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
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
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker that can trigger an assert statement can still lead to a denial of service if the relevant code can be triggered by an attacker, and if the scope of the assert() extends beyond the attacker's own session.
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