{"id":"CVE-2026-71267","aliases":["EUVD-2026-53352","GHSA-3h9h-4m9g-9m4r"],"status":"published","title":"microtar Stack Buffer Overflow in mtar_write_file_header() and mtar_write_dir_header()","description":"microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.","severity":{"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":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00553,"percentile":0.46531,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-08-05T12:26:14Z","modified":"2026-10-24T15:10:00Z","products":[{"vendor":"rxi","product":"microtar"}],"references":[{"url":"https://github.com/rxi/microtar","tags":["third-party-advisory"]},{"url":"https://github.com/rxi/microtar/blob/master/src/microtar.c","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71267"},{"url":"https://github.com/advisories/GHSA-3h9h-4m9g-9m4r"}],"sources":{"cve":[{"id":"CVE-2026-71267","title":"microtar Stack Buffer Overflow in mtar_write_file_header() and mtar_write_dir_header()","description":"microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.","status":"published","published":"2026-08-05T12:26:14.99Z","modified":"2026-08-10T11:46:37.864Z","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":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:19:49.559463Z"}],"euvd":[{"id":"EUVD-2026-53352","description":"microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.","status":"published","published":"2026-08-05T12:26:14Z","modified":"2026-08-10T11:46:37Z","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":"2026-11-02T18:02:05.732685Z"}],"ghsa":[{"id":"GHSA-3h9h-4m9g-9m4r","title":"microtar's mtar_write_file_header() and mtar_write_dir_header() functions (src/microtar.c) copy a...","description":"microtar's mtar_write_file_header() and mtar_write_dir_header() functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte `name` field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy. Any application that calls these functions with an externally-influenced filename longer than 99 characters (e.g. when archiving user-supplied or attacker-controlled filenames) triggers a stack buffer overflow.","status":"published","published":"2026-08-05T15:32:20Z","modified":"2026-08-05T15:32:23Z","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"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:10:07.328501Z"}],"nvd":[{"id":"CVE-2026-71267","description":"microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.","status":"published","published":"2026-08-05T13:24:50.963Z","modified":"2026-10-24T15:10:00.19Z","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":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:12:35.031043Z"}]}}