{"id":"CVE-2026-56412","published":"2026-06-21T15:58:59Z","modified":"2026-06-22T16:31:06Z","title":"libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth…","vendor":"libexpat project","product":"libexpat","tier":"tail","description":{"text":"libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.","provenance":"source","from":"CVE.org"},"cvss":{"score":4.9,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00179,"percentile":0.07406,"provenance":"source"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"https://github.com/libexpat/libexpat/pull/1278","tags":[]}],"priority":{"score":4.9,"factors":[{"name":"EPSS percentile","points":1.48},{"name":"CVSS severity","points":3.43}]},"vendorSlug":"libexpat-project","affectedVersions":[{"vendor":"libexpat project","product":"libexpat","versions":["< 2.8.2"]}],"euvd":{"id":"EUVD-2026-38189","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-libexpat-cve-2026-50219","parents":[{"from":"CVE-2026-50219","to":"CVE-2026-56412","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.","from":"CVE.org","in":"CVE-2026-56412"},{"kind":"similar","provenance":"machine","score":0.41,"basis":"same product + CWE + description similarity"}]}],"children":[{"from":"CVE-2026-56412","to":"CVE-2026-76957","relation":"related","confidence":"medium","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"related","quote":"NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.","from":"CVE.org","in":"CVE-2026-76957"},{"kind":"similar","provenance":"machine","score":0.44,"basis":"same product + CWE + description similarity"}]}]}}