FKIE_CVE-2026-47691

Vulnerability from fkie_nvd - Published: 2026-06-12 16:16 - Updated: 2026-07-03 13:17
Severity
8.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
8.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Summary
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
References
security-advisories@github.comhttps://github.com/netty/netty/releases/tag/netty-4.1.135.FinalRelease Notes
security-advisories@github.comhttps://github.com/netty/netty/releases/tag/netty-4.2.15.FinalRelease Notes
security-advisories@github.comhttps://github.com/netty/netty/security/advisories/GHSA-5pvg-856g-cp85Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26017
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26018
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26586
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34608
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-47691
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2488439
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47691.json
Impacted products
Vendor Product Version
netty netty *
netty netty *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "netty",
          "vendor": "netty",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.2.0.Final, \u003c 4.2.15.Final"
            },
            {
              "status": "affected",
              "version": "\u003c 4.1.135.Final"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:/a:redhat:apache_camel_quarkus:3.33"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:quarkus:3.27::el8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat build of Quarkus 3.27.4.SP1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:quarkus:3.33::el8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat build of Quarkus 3.33.2.SP1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:amq_streams:2.9::el9"
          ],
          "defaultStatus": "affected",
          "product": "Streams for Apache Kafka 2.9.4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:cryostat:4"
          ],
          "defaultStatus": "affected",
          "product": "Cryostat 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:serverless:1"
          ],
          "defaultStatus": "affected",
          "product": "OpenShift Serverless",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:apache_camel_hawtio:4"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat build of Apache Camel - HawtIO 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "product": "Red Hat build of Apache Camel 4 for Quarkus 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "product": "Red Hat build of Apache Camel for Spring Boot 4",
          "vendor": "Red Hat"
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        {
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          "product": "Red Hat build of Apicurio Registry 3",
          "vendor": "Red Hat"
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          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:build_keycloak:"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Build of Keycloak",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat Data Grid 8",
          "vendor": "Red Hat"
        },
        {
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          "defaultStatus": "affected",
          "product": "Red Hat Fuse 7",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:7"
          ],
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          "product": "Red Hat JBoss Enterprise Application Platform 7",
          "vendor": "Red Hat"
        },
        {
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          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jbosseapxp"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_ai"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift AI (RHOAI)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_devspaces:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Dev Spaces",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:amq_streams:3"
          ],
          "defaultStatus": "affected",
          "product": "streams for Apache Kafka 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux_ai:3"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Enterprise Linux AI (RHEL AI) 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:red_hat_single_sign_on:7"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Single Sign-On 7",
          "vendor": "Red Hat"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3097D962-A32D-4467-AAE7-F4CBA3A349D2",
              "versionEndExcluding": "4.1.135",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "413D4611-A46C-4BE4-AB2F-D86282F65984",
              "versionEndExcluding": "4.2.15",
              "versionStartIncluding": "4.2.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty\u0027s `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record\u0027s name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain\u0027s key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain\u0027s key. Versions 4.1.135.Final and 4.2.15.Final patch the issue."
    }
  ],
  "id": "CVE-2026-47691",
  "lastModified": "2026-07-03T13:17:23.503",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
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        "type": "Secondary"
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          "attackVector": "NETWORK",
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          "baseScore": 10.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N",
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          "attackVector": "NETWORK",
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          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
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        "ssvcData": {
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          "options": [
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            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          "role": "CISA Coordinator",
          "timestamp": "2026-06-12T00:00:00+00:00",
          "version": "2.0.3"
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  "published": "2026-06-12T16:16:30.310",
  "references": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary"
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  ]
}


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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

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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.