RHSA-2026:19752
Vulnerability from csaf_redhat - Published: 2026-05-20 17:20 - Updated: 2026-05-21 02:25Summary
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:
unbound:
* python3-unbound-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-anchor-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-devel-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-dracut-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-libs-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-munin-1.25.1-0.1.hum1 (noarch)
* unbound-utils-1.25.1-0.1.hum1 (aarch64, x86_64)
* unbound-1.25.1-0.1.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 discovered in Unbound’s DNSSEC validator can leave it using an invalid memory pointer after certain DS sub-query validations fail due to NSEC3 budget exhaustion. This may cause crashes and could potentially allow arbitrary code execution.
8.1 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:unbound-main@aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@noarch | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@src | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
A flaw was found in Unbound, a Domain Name System (DNS) resolver. A remote attacker could trigger a heap overflow by sending specially crafted DNS reply packets. This occurs when Unbound attempts to encode multiple Name Server Identifier (NSID) or Extension Mechanisms for DNS (EDNS) Cookie options, or EDNS Padding options, and these options are enabled. Successful exploitation of this vulnerability could lead to a denial of service (DoS), making the Unbound service unavailable.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:unbound-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in Unbound's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is created that the validator later dereferences, causing an immediate process crash. Any application or infrastructure relying on Unbound for DNS resolution could be forced to exit unexpectedly, resulting in a denial-of-service condition.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:unbound-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:unbound-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
19 references
Acknowledgments
Palo Alto
Qifan Zhang
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{
"category": "description",
"text": "A flaw was found in Unbound\u0027s DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is created that the validator later dereferences, causing an immediate process crash. Any application or infrastructure relying on Unbound for DNS resolution could be forced to exit unexpectedly, resulting in a denial-of-service condition.",
"title": "Vulnerability description"
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"text": "unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages",
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},
{
"category": "other",
"text": "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it can be remotely triggered without authentication or user interaction via a single crafted DNS query. Successful exploitation allows an attacker to crash the Unbound resolver process, disrupting DNS resolution for all dependent services. The vulnerability\u0027s root cause is the use of incorrect counters to calculate write offsets, leading to dereference of an uninitialized pointer and subsequent 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"
}
],
"product_status": {
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:19752"
},
{
"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:unbound-main@aarch64",
"Red Hat Hardened Images:unbound-main@noarch",
"Red Hat Hardened Images:unbound-main@src",
"Red Hat Hardened Images:unbound-main@x86_64"
]
}
],
"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:unbound-main@aarch64",
"Red Hat Hardened Images:unbound-main@noarch",
"Red Hat Hardened Images:unbound-main@src",
"Red Hat Hardened Images:unbound-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages"
}
]
}
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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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