GHSA-WJPC-4F29-83H3

Vulnerability from github – Published: 2026-01-05 19:42 – Updated: 2026-01-06 16:07
VLAI
Summary
badkeys vulnerable to ASCII control character injection on console via malformed input
Details

Impact

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.

Patches

This has been fixed with the following commits: https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087 https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a

All users should upgrade badkeys to version 0.0.16.

Resources

https://github.com/badkeys/badkeys/issues/40

Severity
2.0 (Low)
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
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.0.15"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "badkeys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21439"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-150"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-05T19:42:12Z",
    "nvd_published_at": "2026-01-06T00:15:49Z",
    "severity": "LOW"
  },
  "details": "### 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",
  "id": "GHSA-wjpc-4f29-83h3",
  "modified": "2026-01-06T16:07:15Z",
  "published": "2026-01-05T19:42:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/badkeys/badkeys/issues/40"
    },
    {
      "type": "WEB",
      "url": "https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/badkeys/badkeys"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "badkeys vulnerable to ASCII control character injection on console via malformed input"
}



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