{"cve":{"cve_id":"CVE-2026-86143","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00119,"epss_percentile":0.0201,"epss_as_of":"2026-09-15","description":"In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.","published_at":"2026-09-05T04:31:21.187000Z","last_modified_at":"2026-09-15T19:31:15.857000Z","cvss_v3_score":6.9,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-192"],"nvd_references":["https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4","https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35","https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-05T05:34:30.375930Z","updated_at":"2026-09-16T00:06:57.780608Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"xmlsoft","vendor_name":"xmlsoft","product_slug":"libxml2","product_name":"libxml2","version_start":"0","version_start_inclusive":true,"version_end":"2.15.4","version_end_inclusive":false,"cpe23_uri":"cve5:xmlsoft:libxml2:0:2.15.4"},{"vendor_slug":"xmlsoft","vendor_name":"xmlsoft","product_slug":"libxml2","product_name":"libxml2","version_start":null,"version_start_inclusive":null,"version_end":"2.15.4","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4","source_type":"MISC","tags":[]},{"url":"https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35","source_type":"PATCH","tags":["patch"]},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-09-05T04:31:21.187000Z","label":"CVE published","source":null}]}