{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "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 Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/oraclelinux6els/vex/2026/cve-2026-80213-els_os-oraclelinux6els.json" } ], "tracking": { "current_release_date": "2026-10-27T08:03:53Z", "generator": { "date": "2026-10-27T08:03:53Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-80213-ELS_OS-ORACLELINUX6ELS", "initial_release_date": "2026-08-27T17:20:00Z", "revision_history": [ { "date": "2026-08-27T17:20:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-27T08:03:53Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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{ "category": "default_component_of", "full_product_name": { "name": "ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.x86_64" }, "product_reference": "ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "ruby-irb-0:1.8.7.374-5.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.x86_64" }, "product_reference": "ruby-irb-0:1.8.7.374-5.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-80213", "cwe": { "id": "CWE-197", "name": "Numeric Truncation Error" }, "notes": [ { "category": "description", "text": "An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::MessageEncoder wrote a DNS label's length into a single octet without checking its range. A label longer than 255 octets had its length stored modulo 256 but the label data was written unchanged, and thus the bytes on the wire described a different name than the one the application asked to encode. RFC 1035 section 2.3.4 limits a label to 63 octets, and the two high bits of the length octet are reserved for compression pointers. put_string packed the length with put_pack(\"C\", d.length) and put_label used it for labels, and thus any value from 0 to 255 could end up as a label length octet, including the reserved 0x40-0xBF range and the 0xC0-0xFF pointer range. Resolv::DNS::Name.create did not check per-label or total name length either, and thus an attacker-controlled hostname reached the encoder unchanged. An application that resolves an attacker-controlled hostname sends a query whose wire bytes name a domain the attacker chose. A hostname suffix that the application validates against an allowlist becomes padding that never appears on the wire, and thus allowlist and egress checks can be bypassed. The recursive resolver caches the response under the attacker's name, and DNS logs record that name rather than the one the application asked for. A label length whose low octet lands in the 0xC0-0xFF range produces a length octet that conforming parsers read as the start of a compression pointer, with the following attacker-controlled byte as the offset.", "title": "Vulnerability description" } ], "product_status": { "known_affected": [ "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-80213" }, { "category": "external", "summary": "https://github.com/ruby/resolv", "url": "https://github.com/ruby/resolv" }, { "category": "external", "summary": "https://www.ruby-lang.org/en/news/2026/08/27/multiple-vulnerabilities-in-resolv/", "url": "https://www.ruby-lang.org/en/news/2026/08/27/multiple-vulnerabilities-in-resolv/" } ], "release_date": "2026-08-27T17:20:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-10-15T10:08:34.340145Z", "details": "- The flaw is confined to Ruby applications that resolve names through the resolv gem (or via resolv-replace); ordinary socket paths such as Net::HTTP/TCPSocket use the operating system resolver and are not exposed, so the system resolver on Linux servers/VMs is unaffected. \n- Exploitation requires the application to accept an attacker‑controlled hostname that exceeds DNS length limits (label >63 or total >255 octets), and the resulting impact is only a misdirected DNS query (scope change with low integrity effect, no confidentiality or availability loss). \n- Given these strict preconditions and its application‑level scope, environments that do not explicitly route DNS resolution through the resolv gem can safely deprioritize this CVE.", "product_ids": [ "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-devel-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-docs-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-irb-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-libs-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-rdoc-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-ri-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-static-0:1.8.7.374-5.el6.x86_64", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.i686", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.tuxcare.els1.i686", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:ruby-tcltk-0:1.8.7.374-5.el6.x86_64" ] } ] } ] }