CVE-2026-21439
badkeys is a tool and library for checking cryptographic public keys for known vulnerabilities.
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 2.0 LOWCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-150
- Affected
- badkeys/badkeys
- Source
- security-advisories@github.com
References
- https://github.com/badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349aPatch
- https://github.com/badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087Patch
- https://github.com/badkeys/badkeys/issues/40Exploit, Issue Tracking, Third Party Advisory
- https://github.com/badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3Third Party Advisory
- https://github.com/badkeys/badkeys/issues/40Exploit, Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.