Medium severity5.3OSV Advisory· Published Jan 6, 2026· Updated Jun 17, 2026
CVE-2026-21439
CVE-2026-21439
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
badkeysPyPI | < 0.0.16 | 0.0.16 |
Affected products
3Patches
Vulnerability mechanics
References
6- github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349anvdPatchWEB
- github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087nvdPatchWEB
- github.com/badkeys/badkeys/issues/40nvdExploitIssue TrackingThird Party AdvisoryWEB
- github.com/advisories/GHSA-wjpc-4f29-83h3ghsaADVISORY
- github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3nvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-21439ghsaADVISORY
News mentions
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