CVE-2026-21439

5.3 MEDIUM
Published: January 06, 2026 Modified: January 12, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/badkeys/badkeys/issues/40
Source: security-advisories@github.com
Exploit Issue Tracking Third Party Advisory
https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3
Source: security-advisories@github.com
Third Party Advisory
https://github.com/badkeys/badkeys/issues/40
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Issue Tracking Third Party Advisory

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
EPSS (Exploit Probability)
0.0%
3th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

badkeys