{"id":"CVE-2026-73569","revision":null,"records":[{"revision":"48197c7710e645dcb7fe52e3596db47c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73569","aliases":[],"title":"fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits","description":"fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.","state":0,"publishedAt":"2026-08-13T17:45:25.045+00:00","modifiedAt":"2026-08-13T18:40:13.283+00:00","affected":[{"ecosystem":"Vendor product","name":"fast-xml-parser","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"NaturalIntelligence\",\n                    \"product\": \"fast-xml-parser\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 5.9.3, < 5.10.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"}],"references":["https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q","https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f","https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73569","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73569","identifiers":["CVE-2026-73569"]},"retained":false,"historicalAffected":[]},{"revision":"bcaeef58e4e242838e3f058844164b15","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73569","aliases":[],"title":"fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passe…","description":"fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.","state":0,"publishedAt":"2026-08-13T18:18:19.803+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f","https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1","https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73569","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-776"],"productCriteria":[],"sourceDates":{"published":"2026-08-13T18:18:19.803","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73569","identifiers":["CVE-2026-73569"]},"retained":false,"historicalAffected":[]},{"revision":"e7b252ec65dd4a08a41973a131f7a2fb","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-8r6m-32jq-jx6q","aliases":["CVE-2026-73569"],"title":"fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits","description":"### Impact\n`fast-xml-parser` processes multiple \"DOCTYPE\" declarations within a single XML document. Each declaration passes its entities to `@nodable/entities` through `addInputEntities()`.\n\n`addInputEntities()` resets the entity expansion counters every time it is called. An attacker can therefore insert additional DOCTYPE declarations to repeatedly reset maxTotalExpansions and maxExpandedLength during one parse operation.\n\nThis allows a crafted XML document to exceed the configured entity-expansion limits and can cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination.\n\n### Workarounds\n- Manually check if multiple DOCTYPEs are not present in input contents\n- Update to v5.10.1\n- Keep `processEntity` flag off","state":0,"publishedAt":"2026-07-21T22:06:36+00:00","modifiedAt":"2026-09-10T03:51:11.0960458+00:00","affected":[{"ecosystem":"npm","name":"fast-xml-parser","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"5.9.3"},{"kind":"fixed","version":"5.10.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q","https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f","https://github.com/NaturalIntelligence/fast-xml-parser","https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1"],"sourceUrl":"https://github.com/advisories/GHSA-8r6m-32jq-jx6q","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8r6m-32jq-jx6q","identifiers":["GHSA-8r6m-32jq-jx6q","CVE-2026-73569"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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