CVE-2026-21439

MEDIUM
2026-01-06 [email protected] GHSA-wjpc-4f29-83h3
5.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 12, 2026 - 18:18 vuln.today
Public exploit code
Patch Released
Jan 12, 2026 - 18:18 nvd
Patch available
CVE Published
Jan 06, 2026 - 00:15 nvd
MEDIUM 5.3

Tags

Ssh Badkeys

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.

Analysis

badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities. [CVSS 5.3 MEDIUM]

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: +20

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CVE-2026-21439 vulnerability details – vuln.today
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