{"action":"Upgrade fast-xml-parser to 4.5.4 or later.","affected":[{"fixed":"4.5.4","introduced":"4.1.3"},{"fixed":"5.3.6","introduced":"5.0.0"}],"component":"fast-xml-parser","cve_ids":["CVE-2026-26278"],"ecosystem":"npm","epss":0.01082,"exploited":false,"fixed_versions":["4.5.4","5.3.6"],"ghsa_id":"GHSA-jmr7-xgp7-cmfj","id":"tcs_01M5KFYENNQQEHMGA4Z15MF438","modified_at":"2026-09-10T03:50:35.274601096Z","published_at":"2026-02-17T21:30:10Z","references":["https://osv.dev/vulnerability/GHSA-jmr7-xgp7-cmfj","https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj","https://nvd.nist.gov/vuln/detail/CVE-2026-26278","https://github.com/NaturalIntelligence/fast-xml-parser/commit/910dae5be2de2955e968558fadf6e8f74f117a77","https://github.com/NaturalIntelligence/fast-xml-parser","https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-jmr7-xgp7-cmfj","url":"https://osv.dev/vulnerability/GHSA-jmr7-xgp7-cmfj"}],"summary":"fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)"}