RHSA-2026:7645

Vulnerability from csaf_redhat - Published: 2026-04-11 00:39 - Updated: 2026-04-19 19:38
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
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:7645
Workaround 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.
References
To clipboard 

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        "name": "Acceptance of Extraneous Untrusted Data With Trusted Data"
      },
      "discovery_date": "2025-10-22T13:01:00.832584+00:00",
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      "notes": [
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          "title": "Vulnerability description"
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          "text": "unbound: Unbound domain hijacking via promiscuous records",
          "title": "Vulnerability summary"
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          "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"
        }
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        }
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          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:unbound-main@noarch",
            "Red Hat Hardened Images:unbound-main@src",
            "Red Hat Hardened Images:unbound-main@x86_64"
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            "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": "HIGH",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
            "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": "Moderate"
        }
      ],
      "title": "unbound: Unbound domain hijacking via promiscuous records"
    }
  ]
}


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