{"id":"CVE-2020-35963","aliases":["BIT-fluent-bit-2020-35963","EUVD-2020-23546","GHSA-h5px-998j-r7c9"],"status":"published","title":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it...","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01326,"percentile":0.7138,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-01-03T18:15:48Z","modified":"2026-09-08T08:47:09Z","fixes":[{"ecosystem":"Bitnami","package":"fluent-bit","fixed_in":["1.6.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"fluent-bit","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.6.4"}]}]}],"products":[{"vendor":"treasuredata","product":"fluent_bit"}],"references":[{"url":"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27261","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","advisory","report"]},{"url":"https://fluentbit.io/announcements/v1.6.4/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory"]},{"url":"https://github.com/fluent/fluent-bit/commit/cadff53c093210404aed01c4cf586adb8caa07af","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-35963","tags":["web"]},{"url":"https://fluentbit.io/announcements/v1.6.4"},{"url":"https://github.com/advisories/GHSA-h5px-998j-r7c9"}],"sources":{"cve":[{"id":"CVE-2020-35963","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2021-01-03T18:15:48Z","modified":"2024-08-04T17:16:13.85Z","updated_at":"2026-11-02T14:35:57.975444Z"}],"euvd":[{"id":"EUVD-2020-23546","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2021-01-03T18:15:48Z","modified":"2024-08-04T17:16:13Z","updated_at":"2026-11-03T03:07:04.595509Z"}],"ghsa":[{"id":"GHSA-h5px-998j-r7c9","title":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it...","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2022-05-24T17:37:51Z","modified":"2024-04-04T03:04:04Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:56:13.24073Z"}],"nvd":[{"id":"CVE-2020-35963","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2021-01-03T19:15:11.673Z","modified":"2026-06-17T03:14:40.55Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:28.340168Z"}],"osv":[{"id":"CVE-2020-35963","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2021-01-03T19:15:11.673Z","modified":"2026-04-11T13:53:10.034741Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.612899Z"},{"id":"BIT-fluent-bit-2020-35963","description":"flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.","status":"published","published":"2024-03-06T10:52:31.995Z","modified":"2026-09-08T08:47:09.757559513Z","updated_at":"2026-11-02T15:28:29.563843Z"}]}}