RHSA-2026:20334

Vulnerability from csaf_redhat - Published: 2026-05-21 21:26 - Updated: 2026-05-21 21:49
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: bind: * bind-9.18.49-1.hum1 (aarch64, x86_64) * bind-chroot-9.18.49-1.hum1 (aarch64, x86_64) * bind-devel-9.18.49-1.hum1 (aarch64, x86_64) * bind-dnssec-utils-9.18.49-1.hum1 (aarch64, x86_64) * bind-doc-9.18.49-1.hum1 (noarch) * bind-libs-9.18.49-1.hum1 (aarch64, x86_64) * bind-utils-9.18.49-1.hum1 (aarch64, x86_64) * bind-9.18.49-1.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-2026-3039

A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:bind-main@noarch —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:bind-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-5946

No description is available for this CVE.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:bind-main@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:bind-main@noarch —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:bind-main@src —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:bind-main@x86_64 —
Vendor Fix fix
Threats
Impact Important
References
To clipboard 

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        "text": "This update includes the following RPMs:\n\nbind:\n  * bind-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-chroot-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-devel-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-dnssec-utils-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-doc-9.18.49-1.hum1 (noarch)\n  * bind-libs-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-utils-9.18.49-1.hum1 (aarch64, x86_64)\n  * bind-9.18.49-1.hum1.src (src)",
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      "cve": "CVE-2026-3039",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-05-19T09:48:19.212000+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2479767"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Important: BIND servers configured for TKEY-based GSS-API authentication are vulnerable to memory exhaustion when processing maliciously-constructed packets. This can lead to a denial of service, specifically impacting Red Hat deployments integrated with Active Directory or Kerberos for DNS where this authentication method is enabled.",
          "title": "Statement"
        },
        {
          "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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          "Red Hat Hardened Images:bind-main@noarch",
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          "Red Hat Hardened Images:bind-main@x86_64"
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          "url": "https://access.redhat.com/security/cve/CVE-2026-3039"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479767"
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        {
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3039"
        }
      ],
      "release_date": "2026-05-21T12:24:11.051000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-05-21T21:26:52+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:bind-main@aarch64",
            "Red Hat Hardened Images:bind-main@noarch",
            "Red Hat Hardened Images:bind-main@src",
            "Red Hat Hardened Images:bind-main@x86_64"
          ],
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          "url": "https://access.redhat.com/errata/RHSA-2026:20334"
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        {
          "category": "workaround",
          "details": "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.\n\nExample:\n```bash\n# Edit /etc/named.conf and remove or comment out lines related to tkey-gssapi-keytab or tkey-gssapi-credential.\n# For example, remove or comment out:\n# key \"gssapi-key\" {\n#     algorithm GSSAPI;\n#     secret \"BASE64_ENCODED_KEY\";\n# };\n#\n# Then reload the named service:\nsystemctl reload named\n```\nReloading the `named` service may cause a brief interruption in DNS resolution.",
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            "Red Hat Hardened Images:bind-main@noarch",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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            "Red Hat Hardened Images:bind-main@noarch",
            "Red Hat Hardened Images:bind-main@src",
            "Red Hat Hardened Images:bind-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation"
    },
    {
      "cve": "CVE-2026-5946",
      "discovery_date": "2026-05-19T09:57:49.705000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2479771"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "No description is available for this CVE.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind: Invalid handling of CLASS != IN",
          "title": "Vulnerability summary"
        },
        {
          "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"
        }
      ],
      "product_status": {
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          "Red Hat Hardened Images:bind-main@noarch",
          "Red Hat Hardened Images:bind-main@src",
          "Red Hat Hardened Images:bind-main@x86_64"
        ]
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          "summary": "Canonical URL",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5946"
        }
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      "release_date": "2026-05-21T12:32:55.602000+00:00",
      "remediations": [
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          "date": "2026-05-21T21:26:52+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:bind-main@aarch64",
            "Red Hat Hardened Images:bind-main@noarch",
            "Red Hat Hardened Images:bind-main@src",
            "Red Hat Hardened Images:bind-main@x86_64"
          ],
          "restart_required": {
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          },
          "url": "https://access.redhat.com/errata/RHSA-2026:20334"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:bind-main@aarch64",
            "Red Hat Hardened Images:bind-main@noarch",
            "Red Hat Hardened Images:bind-main@src",
            "Red Hat Hardened Images:bind-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bind: Invalid handling of CLASS != IN"
    }
  ]
}


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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.



Detection rules are retrieved from Rulezet.