{"id":"CVE-2019-11940","aliases":["EUVD-2019-3596","GHSA-qp47-5phq-m7xm"],"status":"published","title":"In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header...","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01364,"percentile":0.71982,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2019-12-04T16:30:17Z","modified":"2026-11-05T08:07:03Z","products":[{"vendor":"facebook","product":"proxygen"}],"references":[{"url":"https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://www.facebook.com/security/advisories/cve-2019-11940","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-11940"},{"url":"https://github.com/advisories/GHSA-qp47-5phq-m7xm"}],"sources":{"cve":[{"id":"CVE-2019-11940","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.","status":"published","published":"2019-12-04T16:30:17Z","modified":"2024-08-04T23:10:29.529Z","cwes":["CWE-416"],"updated_at":"2026-11-02T14:32:22.432545Z"}],"euvd":[{"id":"EUVD-2019-3596","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.","status":"published","published":"2019-12-04T16:30:17Z","modified":"2024-08-04T23:10:29Z","updated_at":"2026-11-03T02:40:47.406732Z"}],"ghsa":[{"id":"GHSA-qp47-5phq-m7xm","title":"In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header...","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.","status":"published","published":"2022-05-24T17:02:40Z","modified":"2023-01-28T05:07:38Z","updated_at":"2026-11-02T14:44:33.090384Z"}],"nvd":[{"id":"CVE-2019-11940","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.","status":"published","published":"2019-12-04T17:16:43.773Z","modified":"2026-06-17T02:13:52.683Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:05:38.993437Z"}],"osv":[{"id":"CVE-2019-11940","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.","status":"published","published":"2019-12-04T17:16:43.773Z","modified":"2026-11-05T08:07:03.853816797Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-05T09:08:14.330889Z"}]}}