PYSEC-2026-1212

Vulnerability from pysec - Published: 2026-07-07 16:03 - Updated: 2026-07-07 17:23
VLAI
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
Impacted products
Name purl
badkeys pkg:pypi/badkeys
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "badkeys",
        "purl": "pkg:pypi/badkeys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21439",
    "GHSA-wjpc-4f29-83h3"
  ],
  "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": "PYSEC-2026-1212",
  "modified": "2026-07-07T17:23:49.361145Z",
  "published": "2026-07-07T16:03:14.719026Z",
  "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"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/badkeys"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wjpc-4f29-83h3"
    }
  ],
  "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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