{"id":"CVE-2021-27186","aliases":["BIT-fluent-bit-2021-27186","EUVD-2021-13952","GHSA-gjm8-qc7w-3xxp"],"status":"published","title":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated...","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.02011,"percentile":0.8116,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-476"],"published":"2021-02-10T21:24:31Z","modified":"2026-10-20T10:54:35Z","fixes":[{"ecosystem":"Bitnami","package":"fluent-bit","fixed_in":["1.6.11"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"fluent-bit","ranges":[{"type":"SEMVER","events":[{"introduced":"1.6.10"},{"fixed":"1.6.11"}]}]}],"products":[{"vendor":"treasuredata","product":"fluent_bit"}],"references":[{"url":"https://github.com/fluent/fluent-bit/issues/3044","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","advisory","evidence"]},{"url":"https://github.com/fluent/fluent-bit/pull/3045","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory","advisory","fix"]},{"url":"https://github.com/fluent/fluent-bit/pull/3047","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27186","tags":["web"]},{"url":"https://github.com/advisories/GHSA-gjm8-qc7w-3xxp"}],"sources":{"cve":[{"id":"CVE-2021-27186","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2021-02-10T21:24:31Z","modified":"2024-08-03T20:40:47.402Z","updated_at":"2026-11-02T14:33:04.360272Z"}],"euvd":[{"id":"EUVD-2021-13952","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2021-02-10T21:24:31Z","modified":"2024-08-03T20:40:47Z","updated_at":"2026-11-03T03:24:49.808499Z"}],"ghsa":[{"id":"GHSA-gjm8-qc7w-3xxp","title":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated...","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2022-05-24T17:41:52Z","modified":"2024-04-04T03:04:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:56:13.24073Z"}],"nvd":[{"id":"CVE-2021-27186","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2021-02-10T22:15:13.877Z","modified":"2026-06-17T03:44:25.677Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"CVE-2021-27186","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2021-02-10T22:15:13.877Z","modified":"2026-10-20T10:54:35.150966238Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"BIT-fluent-bit-2021-27186","description":"Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.","status":"published","published":"2024-03-06T10:52:21.886Z","modified":"2026-09-08T08:47:10.21477998Z","updated_at":"2026-11-02T15:28:29.563843Z"}]}}