cve-2026-19667
HIGH CVSS 7.5 csaf_redhat
Description
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
Timeline
- Published
- 2026-09-16 13:46 UTC
- Last Modified
- 2026-09-17
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
No linked vulnerabilities found.
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},
"product_reference": "bind.src",
"relates_to_product_reference": "red_hat_hardened_images"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4",
"product_id": "red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-8"
},
"product_reference": "openshift/ose-rhel-coreos-8",
"relates_to_product_reference": "red_hat_openshift_container_platform_4"
},
{
"category": "default_component_of",
"full_product_name": {
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"product_id": "red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"
},
"product_reference": "openshift/ose-rhel-coreos-9",
"relates_to_product_reference": "red_hat_openshift_container_platform_4"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-19667",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"discovery_date": "2026-09-16T00:00:00+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
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"red_hat_enterprise_linux_6:bind-chroot",
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"red_hat_enterprise_linux_9:dhcp-relay",
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"red_hat_enterprise_linux_9:dhcp.src"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2535435"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in `bind9`'s `named` component. A remote attacker, by sending a specially crafted DNS negative answer of exactly 65536 bytes from an authoritative server, can cause a 16-bit length truncation. This results in a zero-byte negative cache entry. When `named` attempts to read this invalid entry, it will unexpectedly terminate, leading to a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in BIND 9's `named` service. An attacker-controlled authoritative server can trigger a `named` abort by sending a precisely sized negative DNS answer. This vulnerability primarily affects BIND instances configured as recursive resolvers that query untrusted authoritative servers, leading to service disruption.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's 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": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-19667"
},
{
"category": "external",
"summary": "RHBZ#2535435",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535435"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-19667",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-19667"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19667",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19667"
},
{
"category": "external",
"summary": "https://downloads.isc.org/isc/bind9/9.20.29",
"url": "https://downloads.isc.org/isc/bind9/9.20.29"
},
{
"category": "external",
"summary": "https://downloads.isc.org/isc/bind9/9.21.26",
"url": "https://downloads.isc.org/isc/bind9/9.21.26"
},
{
"category": "external",
"summary": "https://kb.isc.org/docs/cve-2026-19667",
"url": "https://kb.isc.org/docs/cve-2026-19667"
}
],
"release_date": "2026-09-16T13:46:56.783000+00:00",
"remediations": [
{
"category": "workaround",
"details": "To reduce the exposure to this vulnerability, configure BIND 9 to forward all DNS queries to trusted, non-vulnerable upstream DNS servers. This prevents the local `named` instance from directly interacting with potentially malicious authoritative servers.\n\nExample configuration in `named.conf`:\n```\noptions {\n forwarders { 192.0.2.1; 192.0.2.2; };\n forward only;\n};\n```\nReplace `192.0.2.1` and `192.0.2.2` with the IP addresses of your trusted upstream DNS servers. After modifying the configuration, restart the `named` service for the changes to take effect. This configuration may impact DNS resolution if the configured forwarders are unavailable or do not provide comprehensive resolution.",
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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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"red_hat_enterprise_linux_9:bind-utils",
"red_hat_enterprise_linux_9:bind.src",
"red_hat_enterprise_linux_9:bind9.18",
"red_hat_enterprise_linux_9:bind9.18-chroot",
"red_hat_enterprise_linux_9:bind9.18-devel",
"red_hat_enterprise_linux_9:bind9.18-dnssec-utils",
"red_hat_enterprise_linux_9:bind9.18-doc",
"red_hat_enterprise_linux_9:bind9.18-libs",
"red_hat_enterprise_linux_9:bind9.18-utils",
"red_hat_enterprise_linux_9:bind9.18.src",
"red_hat_enterprise_linux_9:dhcp-client",
"red_hat_enterprise_linux_9:dhcp-common",
"red_hat_enterprise_linux_9:dhcp-relay",
"red_hat_enterprise_linux_9:dhcp-server",
"red_hat_enterprise_linux_9:dhcp.src",
"red_hat_enterprise_linux_9:python3-bind",
"red_hat_hardened_images:bind.src",
"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-8",
"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important",
"product_ids": [
"red_hat_enterprise_linux_10:bind",
"red_hat_enterprise_linux_10:bind-chroot",
"red_hat_enterprise_linux_10:bind-devel",
"red_hat_enterprise_linux_10:bind-dnssec-utils",
"red_hat_enterprise_linux_10:bind-doc",
"red_hat_enterprise_linux_10:bind-libs",
"red_hat_enterprise_linux_10:bind-license",
"red_hat_enterprise_linux_10:bind-utils",
"red_hat_enterprise_linux_10:bind.src",
"red_hat_enterprise_linux_6:bind",
"red_hat_enterprise_linux_6:bind-chroot",
"red_hat_enterprise_linux_6:bind-devel",
"red_hat_enterprise_linux_6:bind-libs",
"red_hat_enterprise_linux_6:bind-sdb",
"red_hat_enterprise_linux_6:bind-utils",
"red_hat_enterprise_linux_6:bind.src",
"red_hat_enterprise_linux_7:bind",
"red_hat_enterprise_linux_7:bind-chroot",
"red_hat_enterprise_linux_7:bind-devel",
"red_hat_enterprise_linux_7:bind-export-devel",
"red_hat_enterprise_linux_7:bind-export-libs",
"red_hat_enterprise_linux_7:bind-libs",
"red_hat_enterprise_linux_7:bind-libs-lite",
"red_hat_enterprise_linux_7:bind-license",
"red_hat_enterprise_linux_7:bind-lite-devel",
"red_hat_enterprise_linux_7:bind-pkcs11",
"red_hat_enterprise_linux_7:bind-pkcs11-devel",
"red_hat_enterprise_linux_7:bind-pkcs11-libs",
"red_hat_enterprise_linux_7:bind-pkcs11-utils",
"red_hat_enterprise_linux_7:bind-sdb",
"red_hat_enterprise_linux_7:bind-sdb-chroot",
"red_hat_enterprise_linux_7:bind-utils",
"red_hat_enterprise_linux_7:bind.src",
"red_hat_enterprise_linux_8:bind",
"red_hat_enterprise_linux_8:bind-chroot",
"red_hat_enterprise_linux_8:bind-devel",
"red_hat_enterprise_linux_8:bind-export-devel",
"red_hat_enterprise_linux_8:bind-export-libs",
"red_hat_enterprise_linux_8:bind-libs",
"red_hat_enterprise_linux_8:bind-libs-lite",
"red_hat_enterprise_linux_8:bind-license",
"red_hat_enterprise_linux_8:bind-lite-devel",
"red_hat_enterprise_linux_8:bind-pkcs11",
"red_hat_enterprise_linux_8:bind-pkcs11-devel",
"red_hat_enterprise_linux_8:bind-pkcs11-libs",
"red_hat_enterprise_linux_8:bind-pkcs11-utils",
"red_hat_enterprise_linux_8:bind-sdb",
"red_hat_enterprise_linux_8:bind-sdb-chroot",
"red_hat_enterprise_linux_8:bind-utils",
"red_hat_enterprise_linux_8:bind.src",
"red_hat_enterprise_linux_8:bind9.16",
"red_hat_enterprise_linux_8:bind9.16-chroot",
"red_hat_enterprise_linux_8:bind9.16-devel",
"red_hat_enterprise_linux_8:bind9.16-dnssec-utils",
"red_hat_enterprise_linux_8:bind9.16-doc",
"red_hat_enterprise_linux_8:bind9.16-libs",
"red_hat_enterprise_linux_8:bind9.16-license",
"red_hat_enterprise_linux_8:bind9.16-utils",
"red_hat_enterprise_linux_8:bind9.16.src",
"red_hat_enterprise_linux_8:python3-bind",
"red_hat_enterprise_linux_8:python3-bind9.16",
"red_hat_enterprise_linux_9:bind",
"red_hat_enterprise_linux_9:bind-chroot",
"red_hat_enterprise_linux_9:bind-devel",
"red_hat_enterprise_linux_9:bind-dnssec-doc",
"red_hat_enterprise_linux_9:bind-dnssec-utils",
"red_hat_enterprise_linux_9:bind-doc",
"red_hat_enterprise_linux_9:bind-libs",
"red_hat_enterprise_linux_9:bind-license",
"red_hat_enterprise_linux_9:bind-utils",
"red_hat_enterprise_linux_9:bind.src",
"red_hat_enterprise_linux_9:bind9.18",
"red_hat_enterprise_linux_9:bind9.18-chroot",
"red_hat_enterprise_linux_9:bind9.18-devel",
"red_hat_enterprise_linux_9:bind9.18-dnssec-utils",
"red_hat_enterprise_linux_9:bind9.18-doc",
"red_hat_enterprise_linux_9:bind9.18-libs",
"red_hat_enterprise_linux_9:bind9.18-utils",
"red_hat_enterprise_linux_9:bind9.18.src",
"red_hat_enterprise_linux_9:dhcp-client",
"red_hat_enterprise_linux_9:dhcp-common",
"red_hat_enterprise_linux_9:dhcp-relay",
"red_hat_enterprise_linux_9:dhcp-server",
"red_hat_enterprise_linux_9:dhcp.src",
"red_hat_enterprise_linux_9:python3-bind",
"red_hat_hardened_images:bind.src",
"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-8",
"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"
]
}
],
"title": "bind9: bind: BIND 9: Denial of Service via 16-bit length truncation in DNS negative cache handling"
}
]
}
Enrichment data
Aggregated bundle (all enrichments)