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-2026-29783

26
FAUCET Score

CVE-2026-29783 is a high-severity arbitrary code execution vulnerability affecting GitHub Copilot CLI versions up to 0.0.422. Attackers can exploit crafted bash parameter expansion patterns to bypass the CLI's safety assessment, allowing hidden commands to execute even when appearing read-only. This can lead to data exfiltration, file modification, or system compromise. The vulnerability has a CVSS score of 7.5 and is not currently known to be actively exploited, nor is there public exploit code or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.0.423CPE matchmatch criteria
cpe:2.3:a:github:copilot_command_line_interface:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

7.5HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
28.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 28th percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: @github/copilotFixed in: 0.0.423
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-g8r9-g2v8-jv6fhigh

GitHub Copilot CLI Dangerous Shell Expansion Patterns Enable Arbitrary Code Execution

Mar 6, 2026

References

github.com / github/copilot-cli/releases/tag/v0.0.423
Release Notes
github.com / github/copilot-cli/security/advisories/GHSA-g8r9-g2v8-jv6f
ExploitVendor Advisory