{"cve":{"cve_id":"CVE-2019-11940","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":0.01364,"epss_percentile":0.69743,"epss_as_of":"2026-08-26","description":"In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.","published_at":"2019-12-04T16:30:17Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"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/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f","https://www.facebook.com/security/advisories/cve-2019-11940"],"vuln_status":null,"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":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:11:59.918297Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"v2017.04.03.00","version_start_inclusive":true,"version_end":"v2017.04.03.00","version_end_inclusive":true,"cpe23_uri":"cve5:facebook:proxygen:v2017.04.03.00:v2017.04.03.00"},{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"v0.29.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:proxygen:v0.29.0:unspecified"},{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"unspecified","version_start_inclusive":true,"version_end":"v0.29.0","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:proxygen:unspecified:v0.29.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f","source_type":"PATCH","tags":["patch"]},{"url":"https://www.facebook.com/security/advisories/cve-2019-11940","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2019-12-04T16:30:17Z","label":"CVE published","source":null}]}