Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-21439

20
FAUCET Score

CVE-2026-21439 affects the badkeys tool (versions 0.0.15 and below), allowing attackers to inject ASCII control characters into output when scanning DKIM, SSH, or filenames. This can lead to misleading information being displayed to users. Rated Medium severity (CVSS 5.3), the vulnerability has a low impact on integrity (I:L) and requires no user interaction or privileges. There is currently no evidence of active exploitation, public exploit code, or significant community discussion regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.0.16CPE matchmatch criteria
cpe:2.3:a:badkeys:badkeys:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 4.0

2.0LOW

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
PROOF_OF_CONCEPT
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 12th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: badkeysFixed in: 0.0.16

Vendor Advisories (1)

pipGHSA-wjpc-4f29-83h3low

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

Jan 5, 2026

References

github.com / badkeys/badkeys/commit/635a2f3b1b50a895d8b09ec8629efc06189f349a
Patch
github.com / badkeys/badkeys/commit/de631f69f040974bb5fb442cdab9a1d904c64087
Patch
github.com / badkeys/badkeys/issues/40
ExploitIssue TrackingThird Party Advisory
github.com / badkeys/badkeys/security/advisories/GHSA-wjpc-4f29-83h3
Third Party Advisory