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

MEDIO 5.3CVE-2026-21439 · GHSA-wjpc-4f29-83h3 · PYSEC-2026-1212 · Published 06/01/2026 · updated 17/06/2026

In breve

CVE-2026-21439 è una vulnerabilità MEDIO (CVSS 5.3) che riguarda badkeys, badkeys (badkeys).
Probabilità di sfruttamento nei prossimi 30 giorni (EPSS): 0.33%, superiore al 26.5% delle vulnerabilità.
Correzione: aggiornare a 0.0.16 o successiva.

Package	Affected versions	Patched versions
badkeys PyPI	`< 0.0.16`	`0.0.16`
badkeys badkeys	`< 0.0.16`	`0.0.16`

Description

Impact

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.

Patches

This has been fixed with the following commits: https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087 https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a

All users should upgrade badkeys to version 0.0.16.

Resources

https://github.com/badkeys/badkeys/issues/40

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.

References

badkeys/badkeys security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-21439 · ADVISORY
badkeys/badkeys · WEB
badkeys/badkeys commit 635a2f3 · WEB
badkeys/badkeys commit de631f6 · WEB
badkeys/badkeys · PACKAGE
pypi.org/project/badkeys · PACKAGE
GitHub Advisory GHSA-wjpc-4f29-83h3 · ADVISORY

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Package

Affected versions

Patched versions

badkeys

PyPI

< 0.0.16

0.0.16

badkeys

< 0.0.16

0.0.16

Description

Impact

Patches

All users should upgrade badkeys to version 0.0.16.

Resources

https://github.com/badkeys/badkeys/issues/40

NVD description