{"id":"CVE-2026-21439","aliases":["EUVD-2026-0823","GHSA-wjpc-4f29-83h3","PYSEC-2026-1212"],"status":"published","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. In versions 0.0.15 and below, an attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the badkeys command-line tool. This impacts scanning DKIM keys (both --dkim and --dkim-dns), SSH keys (--ssh-lines mode), and filenames in various modes. This issue is fixed in version 0.0.16.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00331,"percentile":0.2654,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-150"],"published":"2026-01-05T19:42:12Z","modified":"2026-10-28T02:31:14Z","fixes":[{"ecosystem":"PyPI","package":"badkeys","fixed_in":["0.0.16"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"badkeys","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.0.15"},{"fixed":"0.0.16"}]}]},{"source":"osv","ecosystem":"PyPI","package":"badkeys","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.16"}]}],"versions":["0.0.1","0.0.10","0.0.11","0.0.12","0.0.13","0.0.14","0.0.15","0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9"]},{"source":"osv","ecosystem":"PyPI","package":"badkeys","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.16"}]}],"versions":["0.0.1","0.0.10","0.0.11","0.0.12","0.0.13","0.0.14","0.0.15","0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9"]}],"products":[{"vendor":"badkeys","product":"badkeys"}],"references":[{"url":"https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3","tags":["x_refsource_CONFIRM","Third Party Advisory","advisory","web"]},{"url":"https://github.com/badkeys/badkeys/issues/40","tags":["x_refsource_MISC","exploit","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21439","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-wjpc-4f29-83h3","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21439.json","tags":["advisory"]},{"url":"https://github.com/badkeys/badkeys","tags":["package"]},{"url":"https://pypi.org/project/badkeys","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-21439","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. In versions 0.0.15 and below, an attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the badkeys command-line tool. This impacts scanning DKIM keys (both --dkim and --dkim-dns), SSH keys (--ssh-lines mode), and filenames in various modes. This issue is fixed in version 0.0.16.","status":"published","published":"2026-01-05T23:51:35.67Z","modified":"2026-01-06T19:01:48.962Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low","assessor":"cna"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T13:41:53.237769Z"}],"euvd":[{"id":"EUVD-2026-0823","description":"badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. In versions 0.0.15 and below, an attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the badkeys command-line tool. This impacts scanning DKIM keys (both --dkim and --dkim-dns), SSH keys (--ssh-lines mode), and filenames in various modes. This issue is fixed in version 0.0.16.","status":"published","published":"2026-01-05T23:51:35Z","modified":"2026-01-06T19:01:48Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low"}],"updated_at":"2026-11-02T19:48:55.49901Z"}],"ghsa":[{"id":"GHSA-wjpc-4f29-83h3","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"### Impact\n\nAn attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the `badkeys` command-line tool. This impacts scanning DKIM keys (both `--dkim` and `--dkim-dns`), SSH keys (`--ssh-lines` mode), and filenames in various modes.\n\n### Patches\n\nThis has been fixed with the following commits:\nhttps://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087\nhttps://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a\n\nAll users should upgrade `badkeys` to version 0.0.16.\n\n### Resources\n\nhttps://github.com/badkeys/badkeys/issues/40","status":"published","published":"2026-01-05T19:42:12Z","modified":"2026-01-06T16:07:16Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T14:39:16.156387Z"}],"nvd":[{"id":"CVE-2026-21439","description":"badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. In versions 0.0.15 and below, an attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the badkeys command-line tool. This impacts scanning DKIM keys (both --dkim and --dkim-dns), SSH keys (--ssh-lines mode), and filenames in various modes. This issue is fixed in version 0.0.16.","status":"published","published":"2026-01-06T00:15:49.027Z","modified":"2026-06-17T10:18:40.517Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T14:12:03.683495Z"}],"osv":[{"id":"CVE-2026-21439","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. In versions 0.0.15 and below, an attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the badkeys command-line tool. This impacts scanning DKIM keys (both --dkim and --dkim-dns), SSH keys (--ssh-lines mode), and filenames in various modes. This issue is fixed in version 0.0.16.","status":"published","published":"2026-01-05T23:51:35.67Z","modified":"2026-10-28T02:31:14.814828079Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T15:44:58.42038Z"},{"id":"GHSA-wjpc-4f29-83h3","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"### Impact\n\nAn attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the `badkeys` command-line tool. This impacts scanning DKIM keys (both `--dkim` and `--dkim-dns`), SSH keys (`--ssh-lines` mode), and filenames in various modes.\n\n### Patches\n\nThis has been fixed with the following commits:\nhttps://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087\nhttps://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a\n\nAll users should upgrade `badkeys` to version 0.0.16.\n\n### Resources\n\nhttps://github.com/badkeys/badkeys/issues/40","status":"published","published":"2026-01-05T19:42:12Z","modified":"2026-07-07T17:56:57.269524698Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-150"],"updated_at":"2026-11-02T15:46:58.767335Z"},{"id":"PYSEC-2026-1212","title":"badkeys vulnerable to ASCII control character injection on console via malformed input","description":"### Impact\n\nAn attacker may inject content with ASCII control characters like vertical tabs, ANSI escape sequences, etc., that can create misleading output of the `badkeys` command-line tool. This impacts scanning DKIM keys (both `--dkim` and `--dkim-dns`), SSH keys (`--ssh-lines` mode), and filenames in various modes.\n\n### Patches\n\nThis has been fixed with the following commits:\nhttps://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087\nhttps://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a\n\nAll users should upgrade `badkeys` to version 0.0.16.\n\n### Resources\n\nhttps://github.com/badkeys/badkeys/issues/40","status":"published","published":"2026-07-07T16:03:14.719026Z","modified":"2026-07-07T17:46:30.050070798Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P","level":"low"}],"updated_at":"2026-11-02T15:52:54.622769Z"}]}}