{"id":"CVE-2021-39947","aliases":["EUVD-2021-26303","GHSA-hwx9-v7rw-v3qm","UBUNTU-CVE-2021-39947"],"status":"published","title":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14...","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0087,"percentile":0.59269,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"2022-06-06T16:48:14Z","modified":"2026-10-24T10:31:06Z","affected":[{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"gitlab-ci-multi-runner","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.2+dfsg-1","10.5.0+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"gitlab-ci-multi-runner","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.2.0+dfsg-2ubuntu1"]}],"products":[{"vendor":"gitlab","product":"gitlab runner"},{"vendor":"gitlab","product":"gitlab_runner"}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab-runner/-/issues/28732","tags":["x_refsource_MISC","x_transferred","Broken Link","report"]},{"url":"https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39947.json","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-39947"},{"url":"https://github.com/advisories/GHSA-hwx9-v7rw-v3qm"},{"url":"https://ubuntu.com/security/CVE-2021-39947","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-39947","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-39947","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs","status":"published","published":"2022-06-06T16:48:14Z","modified":"2024-08-04T02:20:34.198Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:09.540052Z"}],"euvd":[{"id":"EUVD-2021-26303","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs","status":"published","published":"2022-06-06T16:48:14Z","modified":"2024-08-04T02:20:34Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:21.810275Z"}],"ghsa":[{"id":"GHSA-hwx9-v7rw-v3qm","title":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14...","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs","status":"published","published":"2022-06-07T00:00:34Z","modified":"2023-01-27T05:04:02Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:42:22.530177Z"}],"nvd":[{"id":"CVE-2021-39947","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs","status":"published","published":"2022-06-06T17:15:09.893Z","modified":"2026-06-17T04:04:28.75Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:06.501652Z"}],"osv":[{"id":"CVE-2021-39947","description":"In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several 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