{"id":"CVE-2026-47080","aliases":["EEF-CVE-2026-47080","EUVD-2026-63878","GHSA-67r9-hmxw-h595"],"status":"published","title":"CDATA Section Breakout via Unsanitised ]]\u003e 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 \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.","severity":{"version":"4.0","score":2.1,"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00222,"percentile":0.12903,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-91"],"published":"2026-08-21T09:49:34Z","modified":"2026-10-28T02:30:38Z","fixes":[{"ecosystem":"Hex","package":"xml_builder","fixed_in":["2.4.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Hex","package":"xml_builder","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.7"},{"fixed":"2.4.1"}]}],"versions":["0.0.7","0.0.8","0.0.9","0.1.0","0.1.1","0.1.2","2.0.0","2.1.0","2.1.1","2.1.2","2.1.4","2.2.0","2.3.0","2.4.0"]}],"products":[{"vendor":"joshnuss","product":"xml_builder"}],"references":[{"url":"https://github.com/joshnuss/xml_builder/security/advisories/GHSA-67r9-hmxw-h595","tags":["vendor-advisory","related","advisory"]},{"url":"https://cna.erlef.org/cves/CVE-2026-47080.html","tags":["related","web"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-47080","tags":["related","web"]},{"url":"https://github.com/joshnuss/xml_builder/commit/bfb1ada071ccc1e384c30f782197ca5154106706","tags":["patch","fix"]},{"url":"https://vincent.vulcoord.net/score/?state=Not+Scored\u0026year=2026\u0026year=2025\u0026assigned_to=88bc49d9-8ddd-4227-affc-a613e67abc4d\u0026ordering=-published\u0026cve=CVE-2026-47080","tags":["exploit","evidence"]},{"url":"https://github.com","tags":["web"]},{"url":"https://repo.hex.pm","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47080.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47080","tags":["advisory"]},{"url":"https://github.com/joshnuss/xml_builder","tags":["package"]},{"url":"https://hex.pm/packages/xml_builder","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-47080","title":"CDATA Section Breakout via Unsanitised ]]\u003e 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 \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.","status":"published","published":"2026-08-21T09:49:34.772Z","modified":"2026-08-21T12:32:15.846Z","cvss":[{"version":"4.0","score":2.1,"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","level":"low","assessor":"cna"}],"cwes":["CWE-91"],"updated_at":"2026-11-02T13:36:51.6229Z"}],"euvd":[{"id":"EUVD-2026-63878","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 \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.","status":"published","published":"2026-08-21T09:49:34Z","modified":"2026-08-21T12:32:15Z","cvss":[{"version":"4.0","score":2.1,"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","level":"low"}],"updated_at":"2026-11-02T18:01:37.96401Z"}],"nvd":[{"id":"CVE-2026-47080","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 \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.","status":"published","published":"2026-08-21T10:16:38.497Z","modified":"2026-10-16T15:10:00.103Z","cvss":[{"version":"4.0","score":2.1,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-91"],"updated_at":"2026-11-02T14:12:40.665005Z"}],"osv":[{"id":"CVE-2026-47080","title":"CDATA Section Breakout via Unsanitised ]]\u003e 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 \u003c![CDATA[ and closer ]]\u003e without rewriting or splitting on the embedded ]]\u003e sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on ]]\u003e and emit adjacent CDATA sections. An attacker who can supply input containing ]]\u003e 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.","status":"published","published":"2026-08-21T09:49:34.772Z","modified":"2026-10-28T02:30:38.173512099Z","cvss":[{"version":"4.0","score":2.1,"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","level":"low"}],"cwes":["CWE-91"],"updated_at":"2026-11-02T15:45:06.231145Z"},{"id":"EEF-CVE-2026-47080","title":"CDATA Section Breakout via Unsanitised ]]\u003e in xml_builder","description":"## Summary\n\nXML 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 `\u003c![CDATA[` and closer `]]\u003e` without rewriting or splitting on the embedded `]]\u003e` sequence. Because CDATA sections have no internal escape mechanism, the only safe way to embed arbitrary bytes is to split on `]]\u003e` and emit adjacent CDATA sections. An attacker who can supply input containing `]]\u003e` 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.","status":"published","published":"2026-08-21T09:49:34.772Z","modified":"2026-09-08T05:30:35.345948251Z","cvss":[{"version":"4.0","score":2.1,"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","level":"low"}],"cwes":["CWE-91"],"updated_at":"2026-11-02T15:46:33.047032Z"}]}}