RHSA-2026:95727
Vulnerability from csaf_redhat - Published: 2026-11-06 04:15 - Updated: 2026-11-06 22:22Summary
Red Hat Security Advisory: bind security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for bind is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.
Security Fix(es):
* bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (CVE-2026-3039)
* bind: BIND: Denial of Service via specially crafted DNS messages (CVE-2026-5946)
* bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field (CVE-2026-13321)
* bind: bind9: Potential memory usage beyond configured limits (CVE-2026-11622)
* bind: bind9: Cache poisoning via label count discrepancy, RRSIG, wildcards (CVE-2026-11721)
* bind: bind9: Unexpected exit with NSEC and NSEC3 both present (CVE-2026-13204)
* bind: BIND: Denial of Service via unbounded processing of crafted DNS messages (CVE-2026-19630)
* bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay (CVE-2026-94300)
Bug Fix(es) and Enhancement(s):
* bind: New root trust anchor key for DNSSEC [rhel-6-els] (JIRA:RHEL-131964)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: 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.
A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server.
7.5 (High)
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-32:9.8.2-0.68.rc1.el6_10.20.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-libs-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-libs-32:9.8.2-0.68.rc1.el6_10.20.s390 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-libs-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-libs-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-sdb-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-sdb-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-sdb-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
18 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-chroot-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-chroot-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-chroot-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.s390 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-utils-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-utils-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Workaround
|
|
| Unresolved product id: 6Server-ELS.EXTENSION:bind-utils-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.s390 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-debuginfo-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-devel-32:9.8.2-0.68.rc1.el6_10.20.i686 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-devel-32:9.8.2-0.68.rc1.el6_10.20.s390 | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-devel-32:9.8.2-0.68.rc1.el6_10.20.s390x | — |
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:bind-devel-32:9.8.2-0.68.rc1.el6_10.20.x86_64 | — |
Workaround
|
Threats
Impact
Important
A flaw was found in the bind component, specifically within the `named` daemon. This vulnerability allows a remote attacker to send specially crafted Domain Name System (DNS) messages. These messages, which use unusual classes or meta-classes, can trigger assertion failures in the `named` daemon when processed. Successful exploitation leads to an application level Denial of Service (DoS), making the DNS service unavailable.
7.5 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
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
7.5 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
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).
7.5 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
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.
7.5 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
8.6 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending specially crafted Domain Name System (DNS) protocol messages containing an excessive number of specific structures. Because BIND does not impose a limit on processing these structures, handling the malicious request consumes disproportionate amounts of CPU time and memory, resulting in a Denial of Service (DoS).
7.5 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
A flaw was found in BIND. This vulnerability may allow a remote attacker to achieve arbitrary code execution on the target server. An attacker who captures a valid User Datagram Protocol (UDP) message signed with Generic Security Service Transaction Signature (GSS-TSIG) can replay it while the negotiated key is active. When combined with crafted queries directed to an attacker-controlled DNS zone, this triggers memory corruption in the named service.
8.1 (High)
Affected products
Fixed
11 products, the same list as for
CVE-2026-3039
Known not affected
18 products, the same list as for
CVE-2026-3039
Threats
Impact
Important
References
45 references
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"text": "bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation",
"title": "Vulnerability summary"
},
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"category": "other",
"text": "Important: BIND servers configured for TKEY-based GSS-API authentication are vulnerable to memory exhaustion when processing maliciously-constructed packets. This can lead to a denial of service, specifically impacting Red Hat deployments integrated with Active Directory or Kerberos for DNS where this authentication method is enabled.",
"title": "Statement"
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"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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"text": "A flaw was found in the bind component, specifically within the `named` daemon. This vulnerability allows a remote attacker to send specially crafted Domain Name System (DNS) messages. These messages, which use unusual classes or meta-classes, can trigger assertion failures in the `named` daemon when processed. Successful exploitation leads to an application level Denial of Service (DoS), making the DNS service unavailable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: BIND: Denial of Service via specially crafted DNS messages",
"title": "Vulnerability summary"
},
{
"category": "other",
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"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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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"title": "Vulnerability summary"
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"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.",
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"title": "Statement"
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"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.",
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],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2556407"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in BIND. This vulnerability may allow a remote attacker to achieve arbitrary code execution on the target server. An attacker who captures a valid User Datagram Protocol (UDP) message signed with Generic Security Service Transaction Signature (GSS-TSIG) can replay it while the negotiated key is active. When combined with crafted queries directed to an attacker-controlled DNS zone, this triggers memory corruption in the named service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security has rated this vulnerability as Important rather than Critical because, while remote unauthenticated code execution is possible, exploitation depends on capturing active cryptographic keys within their validity window and orchestrating complex concurrent requests. In standard Red Hat Enterprise Linux deployments, the BIND daemon does not enable GSS-TSIG by default, restricting risk primarily to servers integrated with Kerberos-based identity infrastructure like FreeIPA or Active Directory. Deployments that do not negotiate GSS-TSIG keys or that strictly limit dynamic DNS access to trusted networks remain unexposed to this attack vector.",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-94300"
},
{
"category": "external",
"summary": "RHBZ#2556407",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556407"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-94300",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-94300"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-94300",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94300"
},
{
"category": "external",
"summary": "https://kb.isc.org/docs/cve-2026-94300",
"url": "https://kb.isc.org/docs/cve-2026-94300"
}
],
"release_date": "2026-10-21T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-11-06T04:15:37+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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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:95727"
},
{
"category": "workaround",
"details": "Disable GSS-TSIG in the BIND configuration if Kerberos-authenticated dynamic DNS functionality is not required, or restrict network access to the DNS service using firewall controls.\n\nTo disable GSS-TSIG, comment out or remove the `tkey-gssapi-keytab` and `tkey-gssapi-credential` directives within `/etc/named.conf` (and any referenced include files), then restart the service:\n\nsystemctl restart named\n\nIf operating named inside a chroot environment, execute:\n\nsystemctl restart named-chroot\n\nAlternatively, restrict UDP and TCP traffic on port 53 to trusted network segments using host or network firewalls to block untrusted external access.\n\nCaveats: Disabling GSS-TSIG prevents clients from performing Kerberos-authenticated dynamic DNS modifications, which may disrupt environments relying on automated Active Directory or Identity Management (IdM) enrollment.\nWarning: Restarting the BIND service will momentarily interrupt active DNS query processing and domain name resolution for dependent network clients.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "bind: bind: Arbitrary code execution via GSS-TSIG UDP message replay"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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.
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.
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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.