CVE-2026-21439

LOW2.0

badkeys vulnerable to ASCII control character injection on console via malformed input

Published Jan 5, 2026

Modified 1 months ago

Details

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.

References

WEB

https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a

WEB

https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087

DETECTION

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

WEB

https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-21439

CVSS Analysis