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          "text": "An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::Resource.get_class, Resolv::DNS::Resource::Generic.create, and Resolv::DNS::SvcParam::Generic.create generate a new class for each unknown DNS resource record (type, class) pair, or each unknown SvcParamKey, encountered while decoding a response. Each generated class was permanently registered both as a constant on Resource (or SvcParam::Generic) and as an entry in a class-lookup hash (ClassHash), and thus the class remained reachable through that constant after the response was discarded. Type and class are each 16-bit values, and thus an attacker controlling DNS responses (a spoofed response, or a malicious or hijacked upstream DNS server) has roughly 2^32 distinct (type, class) pairs to choose from. A single response of a few hundred kilobytes carrying tens of thousands of distinct unknown types permanently grows process memory by tens of megabytes; repeated responses accumulate without bound and are never reclaimed by garbage collection, because the constant keeps each class alive. Any code path that calls Resolv::DNS::Message.decode on attacker-influenced DNS responses is affected. resolv is a default gem, and thus this is reachable from a plain Ruby installation without any additional dependency.",
          "title": "Vulnerability description"
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          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-80212"
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          "category": "vendor_fix",
          "date": "2026-09-15T14:02:33.194518Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1789480951",
          "product_ids": [
            "Amazon-Linux-2:ruby-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:ruby-devel-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:ruby-doc-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:ruby-irb-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:ruby-libs-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.i686",
            "Amazon-Linux-2:ruby-libs-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:ruby-tcltk-0:2.0.0.648-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:rubygem-bigdecimal-0:1.2.0-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:rubygem-io-console-0:0.4.2-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:rubygem-json-0:1.7.7-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:rubygem-minitest-0:4.3.2-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:rubygem-psych-0:2.0.0-36.amzn2.0.20.tuxcare.els1.x86_64",
            "Amazon-Linux-2:rubygem-rake-0:0.9.6-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:rubygem-rdoc-0:4.0.0-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:rubygems-0:2.0.14.1-36.amzn2.0.20.tuxcare.els1.noarch",
            "Amazon-Linux-2:rubygems-devel-0:2.0.14.1-36.amzn2.0.20.tuxcare.els1.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789480951"
        },
        {
          "category": "none_available",
          "date": "2026-08-27T17:20:00Z",
          "details": "Affected",
          "product_ids": [
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            "Amazon-Linux-2:ruby-devel-0:2.0.0.648-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:ruby-doc-0:2.0.0.648-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:ruby-irb-0:2.0.0.648-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:ruby-libs-0:2.0.0.648-36.amzn2.0.20.i686",
            "Amazon-Linux-2:ruby-libs-0:2.0.0.648-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:ruby-tcltk-0:2.0.0.648-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:rubygem-bigdecimal-0:1.2.0-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:rubygem-io-console-0:0.4.2-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:rubygem-json-0:1.7.7-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:rubygem-minitest-0:4.3.2-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:rubygem-psych-0:2.0.0-36.amzn2.0.20.x86_64",
            "Amazon-Linux-2:rubygem-rake-0:0.9.6-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:rubygem-rdoc-0:4.0.0-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:rubygems-0:2.0.14.1-36.amzn2.0.20.noarch",
            "Amazon-Linux-2:rubygems-devel-0:2.0.14.1-36.amzn2.0.20.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}