{"schemaVersion":3,"id":"CVE-2019-11940","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2019-12-04T16:30:17.000Z","modified":"2024-08-04T23:10:29.529Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01364,"percentile":0.71411,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01364},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01364,"percentile":0.71411}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01364,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01364,"per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After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"facebook","product":"proxygen","name":"proxygen","label":"proxygen","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"v2017.04.03.00","noFixRecorded":false,"fixedIn":null},{"text":"≥ v0.29.0, < unspecified","noFixRecorded":false,"fixedIn":null},{"text":"≥ 0.29.0, ≤ 2017.04.03.00","noFixRecorded":false,"fixedIn":null}],"versionsText":"v2017.04.03.00 | ≥ v0.29.0, < unspecified | ≥ 0.29.0, ≤ 2017.04.03.00","eol":null,"hubHref":"/vendor/facebook/proxygen"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f","label":"github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f","hostname":"github.com","tags":["X Refsource MISC","Patch","Third Party Advisory"]},{"url":"https://www.facebook.com/security/advisories/cve-2019-11940","label":"www.facebook.com/security/advisories/cve-2019-11940","hostname":"www.facebook.com","tags":["X Refsource CONFIRM","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2019-12-04T16:30:17.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T23:10:29.529Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T10:54:20.148Z","stale":false,"partial":false}}