{"cve":{"cve_id":"CVE-2026-91096","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":0.00255,"epss_percentile":0.15858,"epss_as_of":"2026-10-15","description":"In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.","published_at":"2026-09-28T20:44:57.363000Z","last_modified_at":"2026-09-30T20:17:36.637000Z","cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_v3_severity":"HIGH","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://www.facebook.com/security/advisories/cve-2026-91096","https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083"],"vuln_status":"Deferred","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":"2026-09-28T21:38:54.189035Z","updated_at":"2026-10-02T11:10:38.202748Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"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":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"v2024.10.28.00","version_start_inclusive":true,"version_end":"v2026.09.28.00","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:proxygen:v2024.10.28.00:v2026.09.28.00"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.facebook.com/security/advisories/cve-2026-91096","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-09-28T20:44:57.363000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-09-30T20:38:54.190113Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-30T20:38:54.190113Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-09-30T20:38:54.190113Z","label":"CVSS score revised","source":"cvelistv5"}]}