CVE-2026-21439CWE-150

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

Low · published January 5, 2026

CVSS v4.0
2.0
EPSS
0%
Percentile
25.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.0 · LOW
Vector
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
EPSS
0.00331 · 25.0th percentile
Weakness
CWE-150 · Improper Neutralization of Escape, Meta, or Control Sequences
Published
2026-01-05T23:51Z
EPSS history
Timeline
  • 05 JAN 23:51Z
    badkeys vulnerable to ASCII control character injection on console via malformed input
    cvelistv5