CVE-2026-21439

Summary

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.

Affected Software

VendorProductVersion RangeStatus
badkeysbadkeys< 0.0.16affected

Weaknesses

  • CWE-150: CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References