RHSA-2026:42853
Vulnerability from csaf_redhat - Published: 2026-07-21 14:37 - Updated: 2026-07-22 18:02Summary
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-9.18.50-22.hum1 (aarch64, x86_64)
* bind-chroot-9.18.50-22.hum1 (aarch64, x86_64)
* bind-devel-9.18.50-22.hum1 (aarch64, x86_64)
* bind-dnssec-utils-9.18.50-22.hum1 (aarch64, x86_64)
* bind-doc-9.18.50-22.hum1 (noarch)
* bind-libs-9.18.50-22.hum1 (aarch64, x86_64)
* bind-utils-9.18.50-22.hum1 (aarch64, x86_64)
* bind-9.18.50-22.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.
The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time.
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
References
9 references
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"text": "This update includes the following RPMs:\n\nbind:\n * bind-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-chroot-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-devel-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-dnssec-utils-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-doc-9.18.50-22.hum1 (noarch)\n * bind-libs-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-utils-9.18.50-22.hum1 (aarch64, x86_64)\n * bind-9.18.50-22.hum1.src (src)",
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"title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
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"vulnerabilities": [
{
"cve": "CVE-2026-11605",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2026-07-21T20:02:09.743000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2504266"
}
],
"notes": [
{
"category": "description",
"text": "The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "bind: bind9: Unnecessary validation of DNSSEC signed records",
"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": {
"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"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504266"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-11605"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11605",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11605"
}
],
"release_date": "2026-07-22T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-21T14:37:50+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"
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"restart_required": {
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"url": "https://access.redhat.com/errata/RHSA-2026:42853"
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{
"category": "workaround",
"details": "Upgrade to the patched release most closely related to your current version of BIND 9:\n\n- 9.20.26\n- 9.21.24\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n- 9.20.26-S1",
"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"
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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"
},
"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: bind9: Unnecessary validation of DNSSEC signed records"
}
]
}
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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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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.
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