VDB
RHSA-2026%3A0420
RHSA-2026%3A0420
PUBLISHED
CVSS 7.5 HIGH
A vulnerability was found in BIND 9 resolvers, where processing malformed DNSKEY records from a specially crafted zone can lead to resource exhaustion, primarily causing excessive CPU utilization. This issue enables a remote, unauthenticated attacker to degrade resolver performance and potentially cause a denial of service (DoS) for legitimate DNS clients.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | rhcos-x86_64-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-x86_64-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-aarch64-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-aarch64-4.20.9.6.202601052146-0, rhcos-aarch64-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-aarch64-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-aarch64-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-s390x-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | * |
| Red Hat | rhcos-s390x-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-s390x-4.20.9.6.202601052146-0, rhcos-s390x-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-x86_64-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-x86_64-4.20.9.6.202601052146-0, rhcos-x86_64-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-ppc64le-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | rhcos-ppc64le-4.20.9.6.202601052146-0 |
| Red Hat | rhcos-ppc64le-4.20.9.6.202601052146-0 as a component of Red Hat OpenShift Container Platform 4.20 | *, * |
Timeline
- Jan 14, 2026 CVE Published
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 30, 2026 CVE Updated
References
- https://access.redhat.com/errata/RHSA-2026:0420 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2395108 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2396054 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2405827 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2405829 issue
- https://bugzilla.redhat.com/show_bug.cgi?id=2405830 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_0420.json advisory
- https://access.redhat.com/security/cve/CVE-2025-8677 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-8677 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-8677 advisory
- https://access.redhat.com/security/cve/CVE-2025-9230 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-9230 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-9230 advisory
- https://access.redhat.com/security/cve/CVE-2025-40778 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-40778 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-40778 advisory
- https://access.redhat.com/security/cve/CVE-2025-40780 advisory
- https://www.cve.org/CVERecord?id=CVE-2025-40780 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-40780 advisory
…and 5 more