RHSA-2026:24365

Vulnerability from csaf_opensuse - Published: 2026-06-08 00:00 - Updated: 2026-09-16 18:29
Summary
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-2026:24365. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:24365.
Patchnames: RHSA-2026:24365
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-42944
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Liberty Linux 8:python3-unbound-1.16.2-5.11.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:unbound-1.16.2-5.11.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:unbound-devel-1.16.2-5.11.el8_10.i686 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:unbound-devel-1.16.2-5.11.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:unbound-libs-1.16.2-5.11.el8_10.i686 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:unbound-libs-1.16.2-5.11.el8_10.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-42959
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 6 products, the same list as for CVE-2026-42944
Threats
Impact important
References
To clipboard 

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          "text": "NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options (\u0027nsid\u0027, \u0027answer-cookie\u0027, \u0027pad-responses\u0027 (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.",
          "title": "CVE description"
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        {
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
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            "SUSE Liberty Linux 8:unbound-libs-1.16.2-5.11.el8_10.x86_64"
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          "text": "NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter to calculate write offsets for ADDITIONAL section rrsets. DNAME duplication could increase the ANSWER section count and authority filtering could decrease the AUTHORITY section count and create an uninitialized array slot. Combining these two, the validator later dereferences this uninitialized pointer, causing an immediate process crash. An adversary controlling a DNSSEC-signed domain can trigger this bug with a single query by configuring a DNAME chain with unsigned CNAMEs and a response containing unsigned AUTHORITY records alongside signed ADDITIONAL glue records. Unbound 1.25.1 contains a patch with a fix to use the proper counters to calculate the write offsets.",
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            "SUSE Liberty Linux 8:unbound-devel-1.16.2-5.11.el8_10.x86_64",
            "SUSE Liberty Linux 8:unbound-libs-1.16.2-5.11.el8_10.i686",
            "SUSE Liberty Linux 8:unbound-libs-1.16.2-5.11.el8_10.x86_64"
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      "title": "CVE-2026-42959"
    }
  ]
}



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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.



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.