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CVE-2026-21439 Detail

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
CVSS-BT 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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a GitHub, Inc.
https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087 GitHub, Inc.
https://github.com/badkeys/badkeys/issues/40 CISA-ADP, GitHub, Inc.
https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3 GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences GitHub, Inc.  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-21439
NVD Published Date:
01/05/2026
NVD Last Modified:
01/06/2026
Source:
GitHub, Inc.