RHSA-2026:20334
Vulnerability from csaf_redhat - Published: 2026-05-21 21:26 - Updated: 2026-05-28 02:54Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
bind:
* bind-9.18.49-1.hum1 (aarch64, x86_64)
* bind-chroot-9.18.49-1.hum1 (aarch64, x86_64)
* bind-devel-9.18.49-1.hum1 (aarch64, x86_64)
* bind-dnssec-utils-9.18.49-1.hum1 (aarch64, x86_64)
* bind-doc-9.18.49-1.hum1 (noarch)
* bind-libs-9.18.49-1.hum1 (aarch64, x86_64)
* bind-utils-9.18.49-1.hum1 (aarch64, x86_64)
* bind-9.18.49-1.hum1.src (src)
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
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in BIND resolvers. A remote attacker could exploit this vulnerability by sending a query to a specially crafted zone. This would cause the resolver to consume disproportionate resources, leading to a denial of service (DoS) due to resource exhaustion.
5.3 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
No description is available for this CVE.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in BIND 9. A remote, unauthenticated attacker can exploit an unbounded resend loop vulnerability in the resolver state machine during bad-server handling. By sending specially crafted queries that trigger specific retry conditions, the attacker can cause severe resource exhaustion, leading to a Denial of Service (DoS).
5.3 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
24 references
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"title": "bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation"
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{
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"text": "A flaw was found in BIND resolvers. A remote attacker could exploit this vulnerability by sending a query to a specially crafted zone. This would cause the resolver to consume disproportionate resources, leading to a denial of service (DoS) due to resource exhaustion.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: Amplification vulnerabilities via self-pointed glue records",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "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.",
"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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"product_ids": [
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"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "bind: Amplification vulnerabilities via self-pointed glue records"
},
{
"cve": "CVE-2026-5946",
"discovery_date": "2026-05-19T09:57:49.705000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2479771"
}
],
"notes": [
{
"category": "description",
"text": "No description is available for this CVE.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: Invalid handling of CLASS != IN",
"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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"url": "https://www.cve.org/CVERecord?id=CVE-2026-5946"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5946"
}
],
"release_date": "2026-05-21T12:32:55.602000+00:00",
"remediations": [
{
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"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20334"
}
],
"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"
},
"products": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "bind: Invalid handling of CLASS != IN"
},
{
"cve": "CVE-2026-5950",
"cwe": {
"id": "CWE-835",
"name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
},
"discovery_date": "2026-05-19T10:02:19.938000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2479773"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in BIND 9. A remote, unauthenticated attacker can exploit an unbounded resend loop vulnerability in the resolver state machine during bad-server handling. By sending specially crafted queries that trigger specific retry conditions, the attacker can cause severe resource exhaustion, leading to a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: Unbounded resend loop in BIND 9 resolver",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate: This flaw in the BIND 9 resolver\u0027s state machine can lead to severe resource exhaustion. A remote, unauthenticated attacker could exploit this by sending specially crafted queries that trigger an unbounded resend loop during bad-server handling, potentially causing a denial of service in affected Red Hat products utilizing BIND as a 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"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-5950"
},
{
"category": "external",
"summary": "RHBZ#2479773",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479773"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-5950",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5950"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5950",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5950"
}
],
"release_date": "2026-05-26T03:43:54.314000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-21T21:26:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20334"
},
{
"category": "workaround",
"details": "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.",
"product_ids": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:bind-main@aarch64",
"Red Hat Hardened Images:bind-main@noarch",
"Red Hat Hardened Images:bind-main@src",
"Red Hat Hardened Images:bind-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "bind: Unbounded resend loop in BIND 9 resolver"
}
]
}
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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.
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