CVE-2026-21439
badkeys vulnerable to ASCII control character injection on console via malformed input
- State
- Published
- Severity
- 2.0 Low
- Published
- Jan 5, 2026
- Updated
- Jan 6, 2026
- Reserved
- Dec 29, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | GitHub_M |
Weaknesses
- CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences
Affected Products
| Product | Versions |
|---|---|
badkeysbadkeys |
|
References
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