RHSA-2026:55841
Vulnerability from csaf_opensuse - Published: 2026-08-17 00:00 - Updated: 2026-09-16 18:44Summary
security update for unbound
Severity
Important
Notes
Title of the patch: security update for unbound
Description of the patch: This security update provides a functional equivalent of RHSA-2026:55841.
The original Red Hat(R) advisory is available from the Red Hat web site at
https://access.redhat.com/errata/RHSA-2026:55841.
Patchnames: RHSA-2026:55841
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
7 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Liberty Linux 9:python3-unbound-1.24.2-3.el9_8.4.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-1.24.2-3.el9_8.4.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-devel-1.24.2-3.el9_8.4.i686 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-devel-1.24.2-3.el9_8.4.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-dracut-1.24.2-3.el9_8.4.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-libs-1.24.2-3.el9_8.4.i686 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Liberty Linux 9:unbound-libs-1.24.2-3.el9_8.4.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
7 products, the same list as for
CVE-2026-44690
Threats
Impact
important
References
10 references
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"text": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary sibling zones under NSEC-signed parent domains. A malicious actor with one registered domain under an NSEC-signed TLD can serve malicious insecure DNS responses for unrelated sibling domains (sharing the same parent zone). Arbitrary delegations that do not exist under the parent domain and are covered by the parent\u0027s NSEC chain can be brought into insecure existence by fraudulent wildcard DS records (less labels than expected, unknown algorithm) from the malicious sibling domain. This allows the malicious actor to inject insecure wildcard records for those delegations.",
"title": "CVE description"
}
],
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"text": "In NLnet Labs Unbound 1.23.0 up to and including 1.25.1, when \u0027dns-error-reporting: yes\u0027 is set, the EDNS Report-Channel option (code 18) from the last upstream response is read and uses the option\u0027s length as the length of the agent domain. When a domain name check is performed on the agent domain, the returned lenght is not used and if the agent domain is followed by garbage, those bytes are moved onto the tail of the synthetic \u0027_er.\u0027 report query name. That query name is later used in the iterator via a subquery to send out the DNS Error Report and when Unbound tries to walk that query name during \u0027find_closest_of_type()\u0027, it strips labels using the query name length rather than stopping at the embedded root, walks one byte past it, and feeds the first garbage byte to \u0027dname_query_hash()\u0027 as a label length writing over the stack variable \u0027labuf\u0027. One ordinary upstream response from a delegated zone the attacker controls is sufficient to terminate the daemon.",
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],
"title": "CVE-2026-55973"
}
]
}
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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.
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.
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