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

中 5.3CVE-2026-21439 · GHSA-wjpc-4f29-83h3 · PYSEC-2026-1212 · 06/01/2026 公開 · 17/06/2026 更新

要点

CVE-2026-21439 は badkeys, badkeys (badkeys) に影響する深刻度「中」 (CVSS 5.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.33%（全脆弱性の 26.5% より高い）。
対処：0.0.16 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
badkeys PyPI	`< 0.0.16`	`0.0.16`
badkeys badkeys	`< 0.0.16`	`0.0.16`

概要

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 の説明

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.