{"cve":{"cve_id":"CVE-2026-76957","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":0.00107,"epss_percentile":0.0106,"epss_as_of":"2026-10-15","description":"libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.","published_at":"2026-08-20T04:28:04.788000Z","last_modified_at":"2026-09-08T20:56:31.860000Z","cvss_v3_score":4.9,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/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-416"],"nvd_references":["https://github.com/libexpat/libexpat/pull/1322","https://github.com/libexpat/libexpat/pull/1329"],"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":"2026-08-20T05:42:27.539426Z","updated_at":"2026-09-09T05:37:24.294436Z"},"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":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"libexpat-project","vendor_name":"libexpat project","product_slug":"libexpat","product_name":"libexpat","version_start":"0","version_start_inclusive":true,"version_end":"2.8.4","version_end_inclusive":false,"cpe23_uri":"cve5:libexpat-project:libexpat:0:2.8.4"},{"vendor_slug":"libexpat-project","vendor_name":"libexpat project","product_slug":"libexpat","product_name":"libexpat","version_start":null,"version_start_inclusive":null,"version_end":"2.8.4","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/libexpat/libexpat/pull/1322","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/libexpat/libexpat/pull/1329","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-08-20T04:28:04.788000Z","label":"CVE published","source":null}]}