Amplification vulnerabilities via self-pointed glue records
Published May 20, 2026
5.3
MEDIUMCVSS 3.1
EPSS 0.58%
Description
BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Affected products
-
- Version 9.11.0StatusaffectedConstraints<=9.16.50
- Version 9.11.3-S1StatusaffectedConstraints<=9.16.50-S1
- Version 9.18.0StatusaffectedConstraints<=9.18.48
- Version 9.18.11-S1StatusaffectedConstraints<=9.18.48-S1
- Version 9.20.0StatusaffectedConstraints<=9.20.22
- Version 9.20.9-S1StatusaffectedConstraints<=9.20.22-S1
- Version 9.21.0StatusaffectedConstraints<=9.21.21
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
No data.
Red Hat Hardened Images
bind-main-9.18.49-1.hum1
Fixed · RHSA-2026:20334
Red Hat Enterprise Linux 10
bind
Affected
Red Hat Enterprise Linux 6
bind
Fix deferred
Red Hat Enterprise Linux 7
bind
Fix deferred
Red Hat Enterprise Linux 8
bind
Fix deferred
Red Hat Enterprise Linux 8
bind9.16
Fix deferred
Red Hat Enterprise Linux 9
bind
Affected
Red Hat Enterprise Linux 9
bind9.18
Affected
Red Hat Enterprise Linux 9
dhcp
Fix deferred
Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-8
Fix deferred
Red Hat OpenShift Container Platform 4
openshift/ose-rhel-coreos-9
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Hardened Images | bind-main-9.18.49-1.hum1 | Fixed | RHSA-2026:20334 |
| Red Hat Enterprise Linux 10 | bind | Affected | n/a |
| Red Hat Enterprise Linux 6 | bind | Fix deferred | n/a |
| Red Hat Enterprise Linux 7 | bind | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | bind | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | bind9.16 | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | bind | Affected | n/a |
| Red Hat Enterprise Linux 9 | bind9.18 | Affected | n/a |
| Red Hat Enterprise Linux 9 | dhcp | Fix deferred | n/a |
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Fix deferred | n/a |
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.49, 9.20.23, 9.21.22, 9.18.49-S1, or 9.20.23-S1.
Red Hat statement
Moderate: This vulnerability in BIND resolvers allows for an amplified resource consumption attack. A specially crafted DNS zone can cause a Red Hat system acting as a resolver to consume excessive resources, potentially leading to a denial of service.
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed May 20, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.58% (0.00578) | 45.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.41% (0.00406) | 32.05th | v5 (v2026.06.15) |
| May 21, 2026 | 0.02% (0.00017) | 4.22th | v4 (v2025.03.14) |
References (8)
- https://access.redhat.com/security/cve/CVE-2026-3592 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2479768 Issue Tracking
- https://downloads.isc.org/isc/bind9/9.18.49 patch
- https://downloads.isc.org/isc/bind9/9.20.23 patch
- https://downloads.isc.org/isc/bind9/9.21.22 patch
- https://kb.isc.org/docs/cve-2026-3592 vendor-advisoryVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-3592
- https://www.cve.org/CVERecord?id=CVE-2026-3592
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-3592 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2479768 | Issue Tracking | |
| https://downloads.isc.org/isc/bind9/9.18.49 | patch | |
| https://downloads.isc.org/isc/bind9/9.20.23 | patch | |
| https://downloads.isc.org/isc/bind9/9.21.22 | patch | |
| https://kb.isc.org/docs/cve-2026-3592 | vendor-advisoryVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-3592 | ||
| https://www.cve.org/CVERecord?id=CVE-2026-3592 |
Change history (0)
No recorded changes yet.