Vulnerability-Lookup

RHSA-2026:18556

Vulnerability from csaf_opensuse - Published: 2026-05-19 00:00 - Updated: 2026-09-15 16:06

Summary

security update for unbound

Severity

Moderate

Notes

Title of the patch: security update for unbound

Description of the patch: This security update provides a functional equivalent of RHSA-2026:18556. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:18556.

Patchnames: RHSA-2026:18556

CVE-2024-33655

3.7 (Low)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

Recommended 7 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 10:python3-unbound-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-anchor-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-devel-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-dracut-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-libs-1.24.2-7.el10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 10:unbound-utils-1.24.2-7.el10.x86_64	—	Vendor Fix

Threats

Impact moderate

CVE-2025-11411

6.9 (Medium)


                
                  CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

Affected products

Recommended 7 products, the same list as for CVE-2024-33655

Threats

Impact moderate

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://lists.suse.com/pipermail/suse-liberty-lin…	self
https://www.suse.com/security/cve/CVE-2024-33655/	self
https://www.suse.com/security/cve/CVE-2025-11411/	self
https://www.suse.com/security/cve/CVE-2024-33655	external
https://bugzilla.suse.com/1224102	external
https://bugzilla.suse.com/1280403	external
https://www.suse.com/security/cve/CVE-2025-11411	external
https://bugzilla.suse.com/1252525	external
https://bugzilla.suse.com/1265588	external

JSON

To clipboard

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          "category": "general",
          "text": "The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource consumption) by arranging for DNS queries to be accumulated for seconds, such that responses are later sent in a pulsing burst (which can be considered traffic amplification in some cases), aka the \"DNSBomb\" issue.",
          "title": "CVE description"
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          "text": "https://www.suse.com/security/cve/CVE-2025-11411"
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      ],
      "notes": [
        {
          "category": "general",
          "text": "NLnet Labs Unbound up to and including version 1.24.1 is vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers to update their delegation information for the zone. Usually these RRSets are used to update the resolver\u0027s knowledge of the zone\u0027s name servers. A malicious actor can exploit the possible poisonous effect by injecting NS RRSets (and possibly their respective address records) in a reply. This could be done for example by trying to spoof a packet or fragmentation attacks. Unbound would then proceed to update the NS RRSet data it already has since the new data has enough trust for it, i.e., in-zone data for the delegation point. Unbound 1.24.1 includes a fix that scrubs unsolicited NS RRSets (and their respective address records) from replies mitigating the possible poison effect. Unbound 1.24.2 includes an additional fix that scrubs unsolicited NS RRSets (and their respective address records) from YXDOMAIN and non-referral nodata replies, further mitigating the possible poison effect.",
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}

CVE-2024-33655 (GCVE-0-2024-33655)

Vulnerability from cvelistv5 – Published: 2024-06-06 00:00 – Updated: 2025-11-04 22:06

Summary

The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource consumption) by arranging for DNS queries to be accumulated for seconds, such that responses are later sent in a pulsing burst (which can be considered traffic amplification in some cases), aka the "DNSBomb" issue.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-22 18:13 UTC

CWE

n/a
CWE-400 - Uncontrolled Resource Consumption

Assigner

mitre mitre root

References

15 references

URL	Tags
https://datatracker.ietf.org/doc/html/rfc1035
https://nlnetlabs.nl/projects/unbound/security-ad…
https://github.com/TechnitiumSoftware/DnsServer/b…
https://www.isc.org/blogs/2024-dnsbomb/
https://nlnetlabs.nl/downloads/unbound/CVE-2024-3…
https://github.com/NLnetLabs/unbound/commit/c3206…
https://alas.aws.amazon.com/ALAS-2024-1934.html
https://meterpreter.org/researchers-uncover-dnsbo…
https://sp2024.ieee-security.org/accepted-papers.html
https://gitlab.isc.org/isc-projects/bind9/-/issues/4398
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2025…
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…

Impacted products

1 product

Vendor	Product	Version
technitium	dns_server	Affected: 0 , ≤ 1.19.3 (custom) cpe:2.3:a:technitium:dns_server::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2025-11411 (GCVE-0-2025-11411)

Vulnerability from cvelistv5 – Published: 2025-10-22 12:28 – Updated: 2025-12-05 10:56

Title

Possible domain hijacking via promiscuous records in the authority section

Summary

NLnet Labs Unbound up to and including version 1.24.1 is vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers to update their delegation information for the zone. Usually these RRSets are used to update the resolver's knowledge of the zone's name servers. A malicious actor can exploit the possible poisonous effect by injecting NS RRSets (and possibly their respective address records) in a reply. This could be done for example by trying to spoof a packet or fragmentation attacks. Unbound would then proceed to update the NS RRSet data it already has since the new data has enough trust for it, i.e., in-zone data for the delegation point. Unbound 1.24.1 includes a fix that scrubs unsolicited NS RRSets (and their respective address records) from replies mitigating the possible poison effect. Unbound 1.24.2 includes an additional fix that scrubs unsolicited NS RRSets (and their respective address records) from YXDOMAIN and non-referral nodata replies, further mitigating the possible poison effect.

Severity

5.7 (Medium)


                        
                          CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-22 13:20 UTC

CWE

CWE-349 - Acceptance of Extraneous Untrusted Data With Trusted Data

Assigner

NLnet Labs

References

4 references

URL	Tags
https://www.nlnetlabs.nl/downloads/unbound/CVE-20…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2025…
http://www.openwall.com/lists/oss-security/2025/11/26/4
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

1 product

Vendor	Product	Version
NLnet Labs	Unbound	Affected: 0 , ≤ 1.24.1 (semver)

Date Public

2025-10-22 00:00

Credits

Yuxiao Wu (Tsinghua University) Yunyi Zhang (Tsinghua University) Baojun Liu (Tsinghua University) Haixin Duan (Tsinghua University) TaoFei Guo (Peking University) Yang Luo (Tsinghua University) JianJun Chen (Tsinghua University)

Show details on NVD website

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To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.

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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.

Action not permitted

RHSA-2026:18556

CVE-2024-33655 (GCVE-0-2024-33655)

CVE-2025-11411 (GCVE-0-2025-11411)

Tags

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Nomenclature

Related by attack behaviour