Vulnerability in GitHub Copilot-Cli
CVE-2026-45033
GitHub Copilot CLI brings AI-powered coding assistance directly to your command line. Prior to 1.0.43, a security vulnerability has been identified in GitHub Copilot CLI where a malicious bare git repository nested inside a project directory can achieve arbitrary code execution when the agent performs git operations. By exploiting git's automatic bare repository discovery during directory traversal, an attacker can set core.fsmonitor or other executable config keys to run arbitrary commands without user awareness or approval. The vulnerability arises because git's core.fsmonitor config key (and 15+ similar keys such as core.hookspath, diff.external, merge.tool, etc.) can specify arbitrary shell commands that git will execute as part of normal operations like status, diff, or rev-parse. This vulnerability is fixed in 1.0.43.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- GitHub Copilot-Cli — versions < 1.0.43
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/github/copilot-cli/security/advisories/GHSA-9ccr-r5hg-74gf (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-45033?
- CVE-2026-45033 is a high-severity vulnerability in GitHub Copilot-Cli, classified under CWE-696. CVSS score: 7.8/10. Published 2026-05-13.
- How severe is CVE-2026-45033?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2026-45033 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.