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When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"published","published":"2022-05-13T01:34:06Z","modified":"2025-04-17T15:33:29Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:01:36.418546Z"}],"nvd":[{"id":"CVE-2018-16840","description":"A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"published","published":"2018-10-31T18:29:00.307Z","modified":"2026-06-17T01:44:52.92Z","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":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"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":"2026-11-02T14:04:47.196456Z"}],"osv":[{"id":"ALPINE-CVE-2018-16840","description":"A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"published","published":"2018-10-31T18:29:00.307Z","modified":"2026-10-23T17:17:55.227632259Z","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":"2026-11-02T15:27:47.187336Z"},{"id":"BELL-CVE-2018-16840","title":"CVE-2018-16840 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:50.827155Z","modified":"2026-01-26T09:46:28.14931Z","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":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2018-16840","description":"A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"published","published":"2018-10-31T18:29:00.307Z","modified":"2026-10-20T13:32:43.153925769Z","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":"2026-11-02T15:44:08.533609Z"},{"id":"DEBIAN-CVE-2018-16840","description":"A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"published","published":"2018-10-31T18:29:00.307Z","modified":"2026-10-23T18:03:01.078047641Z","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":"2026-11-02T15:45:30.290351Z"},{"id":"UBUNTU-CVE-2018-16840","description":"A heap use-after-free flaw was found in curl versions from 7.59.0 through 7.61.1 in the code related to closing an easy handle. When closing and cleaning up an 'easy' handle in the `Curl_close()` function, the library code first frees a struct (without nulling the pointer) and might then subsequently erroneously write to a struct field within that already freed struct.","status":"withdrawn","published":"2018-10-31T00:00:00Z","modified":"2026-02-04T02:27:34.526501Z","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"},{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"},{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:17.496046Z"},{"id":"CURL-CVE-2018-16840","title":"use after free in handle close","description":"libcurl contains a heap use after free flaw in code related to closing an easy\nhandle.\n\nWhen closing and cleaning up an \"easy\" handle in the `Curl_close()` function,\nthe library code first frees a struct (without clearing the pointer) and might\nthen subsequently erroneously write to a struct field within that already\nfreed struct.","status":"published","published":"2018-10-31T08:00:00Z","modified":"2026-10-25T01:05:32.549137113Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"openSUSE-SU-2024:10582-1","title":"curl-7.79.1-1.1 on GA media","description":"These are all security issues fixed in the curl-7.79.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:40:36.472951Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2018:3608-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2018-16840: A use after free in closing SASL handles was fixed (bsc#1112758)\n- CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)\n\n","status":"published","published":"2018-11-02T16:09:57Z","modified":"2025-05-02T04:07:55.380943Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2018:3624-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2018-16839: A SASL password overflow via integer overflow was fixed which could lead to crashes (bsc#1112758)\n- CVE-2018-16840: A use-after-free in SASL handle close was fixed which could lead to crashes (bsc#1112758)\n- CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)\n\n","status":"published","published":"2018-11-05T16:55:38Z","modified":"2026-02-04T03:02:44.934958Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2018:3681-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2018-16840: A use-after-free in SASL handle close was fixed (bsc#1112758)\n- CVE-2018-16842: A Out-of-bounds Read in tool_msgs.c was fixed which could lead to crashes (bsc#1113660)\n\n","status":"published","published":"2018-11-08T16:55:53Z","modified":"2026-02-04T02:14:27.808069Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2019:0339-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-3822: Fixed a NTLMv2 type-3 header stack buffer overflow (bsc#1123377).\n- CVE-2019-3823: Fixed an out-of-bounds read in the SMTP end-of-response (bsc#1123378).\n- CVE-2018-16890: Fixed an out-of-bounds buffer read in NTLM type2 (bsc#1123371). \n- CVE-2018-16842: Fixed an out-of-bounds read in tool_msgs.c (bsc#1113660).\n- CVE-2018-16840: Fixed a use-after-free in handle close  (bsc#1113029).\n- CVE-2018-16839: Fixed an SASL password overflow caused by an integer overflow (bsc#1112758).\n\n","status":"published","published":"2019-02-13T07:33:54Z","modified":"2026-02-04T03:49:52.261316Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"USN-3805-1","title":"curl vulnerabilities","description":"Harry Sintonen discovered that curl incorrectly handled SASL\nauthentication. A remote attacker could use this issue to cause curl to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. (CVE-2018-16839)\n\nBrian Carpenter discovered that curl incorrectly handled memory when\nclosing certain handles. A remote attacker could use this issue to cause\ncurl to crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2018-16840)\n\nBrian Carpenter discovered that the curl command-line tool incorrectly\nhandled error messages. A remote attacker could possibly use this issue to\nobtain sensitive information. (CVE-2018-16842)\n","status":"published","published":"2018-10-31T12:38:53Z","modified":"2026-04-22T09:51:03.745102Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}