Vulnerability-Lookup

RHSA-2026:7645

Vulnerability from csaf_redhat - Published: 2026-04-11 00:39 - Updated: 2026-10-05 18:30

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: unbound: * python3-unbound-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-anchor-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-devel-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-dracut-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-libs-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-munin-1.24.2-11.1.hum1 (noarch) * unbound-utils-1.24.2-11.1.hum1 (aarch64, x86_64) * unbound-1.24.2-11.1.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.

CVE-2025-11411

A domain hijacking flaw has been discovered in NLNet Lab's Unbound project. 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.

6.1 (Medium)


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

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

Affected products

Fixed 17 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:python3-unbound-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-unbound-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-0:1.24.2-11.1.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-anchor-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-anchor-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-devel-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-devel-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-dracut-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-dracut-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-libs-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-libs-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-munin-0:1.24.2-11.1.hum1@noarch@public-hummingbird-aarch64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-munin-0:1.24.2-11.1.hum1@noarch@public-hummingbird-x86_64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-utils-0:1.24.2-11.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:unbound-utils-0:1.24.2-11.1.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:7645	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2025-11411	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2025-11411	self
https://bugzilla.redhat.com/show_bug.cgi?id=2405706	external
https://www.cve.org/CVERecord?id=CVE-2025-11411	external
https://nvd.nist.gov/vuln/detail/CVE-2025-11411	external
https://www.nlnetlabs.nl/downloads/unbound/CVE-20…	external

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 CNA

CNA scorecard B 82/100 over 57 records in the last 180 days details

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

JSON

To clipboard

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            "vectorString": "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",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-349",
              "description": "CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-05T10:56:13.103Z",
        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2025-11411.txt"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "This issue is fixed in 1.24.2 and all later versions."
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2025-07-09T00:00:00.000Z",
          "value": "Issue reported by Yuxiao Wu"
        },
        {
          "lang": "en",
          "time": "2025-08-12T00:00:00.000Z",
          "value": "Issue acknowledged and mitigation shared by NLnet Labs"
        },
        {
          "lang": "en",
          "time": "2025-10-22T00:00:00.000Z",
          "value": "Fixes released with Unbound 1.24.1 (coordinated with other vendors)"
        },
        {
          "lang": "en",
          "time": "2025-11-07T00:00:00.000Z",
          "value": "Not complete fix in Unbound 1.24.1 reported by TaoFei Guo"
        },
        {
          "lang": "en",
          "time": "2025-11-07T00:00:00.000Z",
          "value": "Issue acknowledged and mitigation shared by NLnet Labs"
        },
        {
          "lang": "en",
          "time": "2025-11-07T00:00:00.000Z",
          "value": "Mitigation acknowledged by TaoFei Guo"
        },
        {
          "lang": "en",
          "time": "2025-11-26T00:00:00.000Z",
          "value": "Additional fixes released with Unbound 1.24.2"
        }
      ],
      "title": "Possible domain hijacking via promiscuous records in the authority section",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2025-11411",
    "datePublished": "2025-10-22T12:28:02.607Z",
    "dateReserved": "2025-10-07T09:07:44.926Z",
    "dateUpdated": "2025-12-05T10:56:13.103Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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.

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.

Action not permitted

RHSA-2026:7645

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

Tags

Sightings

Nomenclature

Related by attack behaviour