RHSA-2026:54510
Vulnerability from csaf_opensuse - Published: 2026-08-13 11:28 - Updated: 2026-09-23 17:43BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses.
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| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:bind-32:9.16.23-40.el9_8.8.aarch64 | — |
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A flaw was found in BIND 9, a widely used Domain Name System (DNS) software. A remote attacker could exploit this by sending specially crafted, excessively long DNS queries. This could bypass Response Policy Zone (RPZ) rules, which are designed to block access to malicious domains, and potentially cause the BIND 9 software to crash, leading to a denial of service.
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the max-cache-size parameter
It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set synth-from-dnssec yes; (which is the default).
If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof.
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
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"title": "Vulnerability description"
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"text": "bind: bind9: Incorrect acceptance of NSEC3 records",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in BIND allows an attacker to forge authenticated NXDOMAIN responses for sibling zones due to incorrect validation of child-zone NSEC3 records. Exploitation requires high attack complexity, limiting the immediate risk to Red Hat products.",
"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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{
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
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"title": "bind: bind9: Incorrect acceptance of NSEC3 records"
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{
"cve": "CVE-2026-11331",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2026-07-21T16:15:37.317000+00:00",
"ids": [
{
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"text": "2503721"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in BIND 9, a widely used Domain Name System (DNS) software. A remote attacker could exploit this by sending specially crafted, excessively long DNS queries. This could bypass Response Policy Zone (RPZ) rules, which are designed to block access to malicious domains, and potentially cause the BIND 9 software to crash, leading to a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind9: bind: Potential wildcard CNAME RPZ policy bypass",
"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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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11331",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11331"
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{
"category": "vendor_fix",
"date": "2026-08-13T11:28:25+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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"title": "bind9: bind: Potential wildcard CNAME RPZ policy bypass"
},
{
"cve": "CVE-2026-11622",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2026-07-21T20:12:07.757000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2504298"
}
],
"notes": [
{
"category": "description",
"text": "A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the max-cache-size parameter",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind9: Potential memory usage beyond configured limits",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important flaw in BIND\u0027s DNSSEC-validating resolver can lead to a denial of service. An attacker can trigger excessive memory usage by performing a random subdomain attack against a DNSSEC-signed zone, causing the resolver to exceed its `max-cache-size` limits. This is critical for Red Hat deployments where BIND is configured for DNSSEC validation and exposed to untrusted query sources.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-11622"
},
{
"category": "external",
"summary": "RHBZ#2504298",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504298"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-11622",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-11622"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11622",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11622"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-13T11:28:25+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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"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",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "bind: bind9: Potential memory usage beyond configured limits"
},
{
"cve": "CVE-2026-11721",
"cwe": {
"id": "CWE-345",
"name": "Insufficient Verification of Data Authenticity"
},
"discovery_date": "2026-07-21T20:22:21.905000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2504338"
}
],
"notes": [
{
"category": "description",
"text": "It is possible for an attacker\u0027s zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker\u0027s zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set synth-from-dnssec yes; (which is the default).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards",
"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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{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-11721"
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{
"category": "external",
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-11721"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11721",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11721"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-08-13T11:28:25+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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"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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"details": "Important"
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"title": "bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards"
},
{
"cve": "CVE-2026-13204",
"cwe": {
"id": "CWE-617",
"name": "Reachable Assertion"
},
"discovery_date": "2026-07-21T20:41:55.541000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2504447"
}
],
"notes": [
{
"category": "description",
"text": "If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind9: Unexpected exit with NSEC and NSEC3 both present",
"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-2026-13204"
},
{
"category": "external",
"summary": "RHBZ#2504447",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504447"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-13204",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-13204"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-13204",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13204"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-13T11:28:25+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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"baseScore": 7.5,
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"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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{
"category": "impact",
"details": "Important"
}
],
"title": "bind: bind9: Unexpected exit with NSEC and NSEC3 both present"
},
{
"cve": "CVE-2026-13321",
"cwe": {
"id": "CWE-345",
"name": "Insufficient Verification of Data Authenticity"
},
"discovery_date": "2026-07-21T19:40:30.464000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2504166"
}
],
"notes": [
{
"category": "description",
"text": "The BIND resolver accepts validly-signed NSEC records where the \"Next Domain Name\" field points outside the signer\u0027s zone.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An attacker controlling any DNSSEC-signed zone can craft NSEC records that span into victim zones, enabling cross-zone cache poisoning with authenticated denial-of-service responses (AD=1).",
"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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"url": "https://www.cve.org/CVERecord?id=CVE-2026-13321"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-13321",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13321"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-08-13T11:28:25+00:00",
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"restart_required": {
"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:54510"
},
{
"category": "workaround",
"details": "Disclaimer: The following mitigation notes are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nISC states no workarounds exist. Until patched, restrict the resolver to authorized client networks and deploy separate resolvers per trust zone. Memory hardening and auth controls don\u0027t apply \u2014 this is a DNS protocol logic error using validly-signed records.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
"version": "3.1"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field"
}
]
}
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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.