{"id":"CVE-2026-47080","state":"PUBLISHED","title":"CDATA Section Breakout via Unsanitised ]]> in xml_builder","description":"XML Injection vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, XML Injection.\n\nThis vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape/1.\n\nThe escape/1 clause for {:cdata, data} in lib/xml_builder.ex concatenates data verbatim between the CDATA opener <![CDATA[ and closer ]]> without rewriting or splitting on the embedded ]]> sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]> and emit adjacent CDATA sections. An attacker who can supply input containing ]]> closes the CDATA section early; any bytes that follow are parsed as ordinary XML markup by downstream consumers, allowing injection of arbitrary elements, text, or entity references into the output document.\n\nThis issue affects xml_builder: from 0.0.7 before 2.4.1.","publishedAt":"2026-08-21T09:49:34.772Z","updatedAt":"2026-08-21T12:32:15.846Z","severity":{"score":2.1,"label":"Low","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","source":"EEF"},"assigner":"EEF","products":["joshnuss xml_builder"],"affected":[{"vendor":"joshnuss","product":"xml_builder","packageName":"xml_builder","packageURL":"pkg:hex/xml_builder","defaultStatus":"unaffected","versions":[{"version":"0.0.7","status":"affected","lessThan":"2.4.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"],"modules":["'Elixir.XmlBuilder'"],"programFiles":["lib/xml_builder.ex"],"programRoutines":[{"name":"'Elixir.XmlBuilder':generate/1"},{"name":"'Elixir.XmlBuilder':generate/2"},{"name":"'Elixir.XmlBuilder':escape/1"}],"repo":"https://github.com/joshnuss/xml_builder"},{"vendor":"joshnuss","product":"xml_builder","packageName":"joshnuss/xml_builder","packageURL":"pkg:github/joshnuss/xml_builder","defaultStatus":"unaffected","versions":[{"version":"26766f884ed19adee1563522c7afb5f056a6f3b5","status":"affected","lessThan":"bfb1ada071ccc1e384c30f782197ca5154106706","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"],"modules":["'Elixir.XmlBuilder'"],"programFiles":["lib/xml_builder.ex"],"programRoutines":[{"name":"'Elixir.XmlBuilder':generate/1"},{"name":"'Elixir.XmlBuilder':generate/2"},{"name":"'Elixir.XmlBuilder':escape/1"}],"repo":"https://github.com/joshnuss/xml_builder"}],"references":["https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595","https://cna.erlef.org/cves/CVE-2026-47080.html","https://osv.dev/vulnerability/EEF-CVE-2026-47080","https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706","https://vincent.vulcoord.net/score/?state=Not+Scored&year=2026&year=2025&assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d&ordering=-published&cve=CVE-2026-47080"],"weaknesses":["CWE-91"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/47xxx/CVE-2026-47080.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47080","state":"PUBLISHED","datePublished":"2026-08-21T09:49:34.772Z","dateUpdated":"2026-08-21T12:32:15.846Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-05-18T17:28:10.319Z"},"containers":{"cna":{"title":"CDATA Section Breakout via Unsanitised ]]> in xml_builder","descriptions":[{"lang":"en","value":"XML Injection vulnerability in joshnuss xml_builder (XmlBuilder module) allows Content Spoofing, XML Injection.\n\nThis vulnerability is associated with program files lib/xml_builder.ex and program routines XmlBuilder.generate/1, XmlBuilder.generate/2, XmlBuilder.escape/1.\n\nThe escape/1 clause for {:cdata, data} in lib/xml_builder.ex concatenates data verbatim between the CDATA opener <![CDATA[ and closer ]]> without rewriting or splitting on the embedded ]]> sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]> and emit adjacent CDATA sections. An attacker who can supply input containing ]]> closes the CDATA section early; any bytes that follow are parsed as ordinary XML markup by downstream consumers, allowing injection of arbitrary elements, text, or entity references into the output document.\n\nThis issue affects xml_builder: from 0.0.7 before 2.4.1."}],"affected":[{"vendor":"joshnuss","product":"xml_builder","packageName":"xml_builder","packageURL":"pkg:hex/xml_builder","defaultStatus":"unaffected","versions":[{"version":"0.0.7","status":"affected","lessThan":"2.4.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"],"modules":["'Elixir.XmlBuilder'"],"programFiles":["lib/xml_builder.ex"],"programRoutines":[{"name":"'Elixir.XmlBuilder':generate/1"},{"name":"'Elixir.XmlBuilder':generate/2"},{"name":"'Elixir.XmlBuilder':escape/1"}],"repo":"https://github.com/joshnuss/xml_builder"},{"vendor":"joshnuss","product":"xml_builder","packageName":"joshnuss/xml_builder","packageURL":"pkg:github/joshnuss/xml_builder","defaultStatus":"unaffected","versions":[{"version":"26766f884ed19adee1563522c7afb5f056a6f3b5","status":"affected","lessThan":"bfb1ada071ccc1e384c30f782197ca5154106706","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*"],"modules":["'Elixir.XmlBuilder'"],"programFiles":["lib/xml_builder.ex"],"programRoutines":[{"name":"'Elixir.XmlBuilder':generate/1"},{"name":"'Elixir.XmlBuilder':generate/2"},{"name":"'Elixir.XmlBuilder':escape/1"}],"repo":"https://github.com/joshnuss/xml_builder"}],"references":[{"url":"https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-47080.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-47080","tags":["related"]},{"url":"https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":2.1,"baseSeverity":"LOW","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-91","description":"CWE-91 XML Injection (aka Blind XPath Injection)","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-08-21T09:49:34.772Z"},"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:joshnuss:xml_builder:*:*:*:*:*:*:*:*","versionEndExcluding":"2.4.1","versionStartIncluding":"0.0.7","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"finder","value":"Peter Ullrich"},{"lang":"en","type":"remediation developer","value":"Joshua Nussbaum"},{"lang":"en","type":"coordinator","value":"Jonatan Männchen / EEF"}],"impacts":[{"capecId":"CAPEC-250","descriptions":[{"lang":"en","value":"CAPEC-250 XML Injection"}]}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://vincent.vulcoord.net/score/?state=Not+Scored&year=2026&year=2025&assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d&ordering=-published&cve=CVE-2026-47080","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-21T12:30:05.428465Z","id":"CVE-2026-47080","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-21T12:32:15.846Z"}}]}}}