RHSA-2026:36777
Vulnerability from csaf_redhat - Published: 2026-07-08 16:36 - Updated: 2026-07-29 03:45A flaw was found in NLnet Labs Unbound. A remote attacker, by controlling a malicious domain (a "ghost zone") and querying a vulnerable Unbound server, could exploit a vulnerability related to "ghost domain names" attacks. This could allow the attacker to overwrite cached Name Server (NS) records, extending the "ghost domain window" by up to one cached Time To Live (TTL) value. This manipulation could lead to cache poisoning, potentially causing the Unbound server to serve incorrect or malicious DNS information.
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A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending queries with an excessive number of EDNS (Extension Mechanisms for DNS) options. This can cause Unbound threads to be held hostage while parsing and creating internal data structures for these options. Coordinated attacks can lead to resource exhaustion, resulting in a degradation of service or a denial of service (DoS) for legitimate users.
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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A flaw was found in Unbound. An adversary who can query a vulnerable Unbound instance and control a slow or malicious domain name server can exploit a vulnerability in the jostle logic. This flaw allows retransmitted queries to renew the age of slow-running queries, preventing them from being identified as aged and replaced. This can degrade Unbound's resolution performance, potentially leading to a denial of resolution service through coordinated attacks.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.src | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-devel-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending specially crafted DNS responses containing very large Resource Record Sets (RRsets) that require name compression. This can cause Unbound to spend a significant amount of time processing these responses, leading to degraded performance and potentially a denial of service (DoS) for legitimate users.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-0:1.24.2-3.el9_8.2.src | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-debugsource-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-dracut-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.ppc64le | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.s390x | — |
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:unbound-libs-debuginfo-0:1.24.2-3.el9_8.2.x86_64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.aarch64 | — |
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| Unresolved product id: CRB-9.8.0.Z.MAIN.EUS:python3-unbound-debuginfo-0:1.24.2-3.el9_8.2.i686 | — |
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"text": "A flaw was found in NLnet Labs Unbound. A remote attacker, by controlling a malicious domain (a \"ghost zone\") and querying a vulnerable Unbound server, could exploit a vulnerability related to \"ghost domain names\" attacks. This could allow the attacker to overwrite cached Name Server (NS) records, extending the \"ghost domain window\" by up to one cached Time To Live (TTL) value. This manipulation could lead to cache poisoning, potentially causing the Unbound server to serve incorrect or malicious DNS information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Cache manipulation via \u0027ghost domain names\u0027 attack",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-40622"
},
{
"category": "external",
"summary": "RHBZ#2480127",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480127"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-40622",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40622"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-40622",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40622"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40622.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40622.txt"
}
],
"release_date": "2026-05-20T09:18:41.816000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T16:36:29+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:36777"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "unbound: Unbound: Cache manipulation via \u0027ghost domain names\u0027 attack"
},
{
"cve": "CVE-2026-41292",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-05-20T10:00:54.433285+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480125"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending queries with an excessive number of EDNS (Extension Mechanisms for DNS) options. This can cause Unbound threads to be held hostage while parsing and creating internal data structures for these options. Coordinated attacks can lead to resource exhaustion, resulting in a degradation of service or a denial of service (DoS) for legitimate users.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Denial of Service via excessive EDNS options",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-41292"
},
{
"category": "external",
"summary": "RHBZ#2480125",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480125"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-41292",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-41292"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-41292",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41292"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt"
}
],
"release_date": "2026-05-20T09:19:13.022000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T16:36:29+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
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"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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{
"cve": "CVE-2026-42534",
"cwe": {
"id": "CWE-911",
"name": "Improper Update of Reference Count"
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"ids": [
{
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"text": "2480131"
}
],
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{
"category": "description",
"text": "A flaw was found in Unbound. An adversary who can query a vulnerable Unbound instance and control a slow or malicious domain name server can exploit a vulnerability in the jostle logic. This flaw allows retransmitted queries to renew the age of slow-running queries, preventing them from being identified as aged and replaced. This can degrade Unbound\u0027s resolution performance, potentially leading to a denial of resolution service through coordinated attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Denial of Service due to degraded resolution performance in jostle logic",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw is rated as Important. An attacker controlling a malicious DNS server could exploit a vulnerability in Unbound\u0027s jostle logic, leading to degraded resolution performance and a potential denial of service. This occurs because retransmitted queries can incorrectly renew the age of slow-running queries, preventing their proper replacement.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
{
"category": "external",
"summary": "RHBZ#2480131",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480131"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42534",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42534"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42534",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42534"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt"
}
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{
"category": "vendor_fix",
"date": "2026-07-08T16:36:29+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:36777"
},
{
"category": "workaround",
"details": "To mitigate the risk of denial of resolution service, restrict Unbound\u0027s network exposure. Configure Unbound to only accept queries from trusted internal networks and to forward its own queries exclusively to trusted, well-maintained upstream DNS servers. This reduces the opportunity for an adversary to interact with or act as a malicious upstream for the vulnerable Unbound instance. After modifying Unbound\u0027s configuration, a service restart is required for changes to take effect. This may temporarily interrupt DNS resolution services.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"details": "Important"
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"title": "unbound: Unbound: Denial of Service due to degraded resolution performance in jostle logic"
},
{
"cve": "CVE-2026-44390",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-05-20T10:01:12.753383+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480130"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending specially crafted DNS responses containing very large Resource Record Sets (RRsets) that require name compression. This can cause Unbound to spend a significant amount of time processing these responses, leading to degraded performance and potentially a denial of service (DoS) for legitimate users.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "unbound: Unbound: Denial of Service due to excessive resource consumption with large DNS Resource Record Sets",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service vulnerability in Unbound. When configured as a recursive DNS resolver, Unbound can be subjected to excessive resource consumption by a remote attacker sending specially crafted DNS responses containing very large Resource Record Sets. This can lead to degraded performance and a denial of service for legitimate DNS queries, impacting services that rely on the resolver.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480130"
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-44390"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44390",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44390"
},
{
"category": "external",
"summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt",
"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt"
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "unbound: Unbound: Denial of Service due to excessive resource consumption with large DNS Resource Record Sets"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.