CVE-2026-45033Public exploit

Code execution via nested bare repository configuration

Published May 13, 2026 · Updated May 13, 2026

Code execution in GitHub Copilot CLI before 1.0.43 allows local users to run arbitrary commands through a malicious nested bare repository. Git automatically discovers the bare repository and executes core.fsmonitor or similar command-bearing configuration during routine operations. Reachability requires attacker-controlled repository content and a Git operation; execution can expose credentials, modify files, or compromise the workstation.

CVSS severity8.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code execution in GitHub Copilot CLI before 1.0.43 allows local users to run arbitrary commands through a malicious nested bare repository. Git automatically discovers the bare repository and executes core.fsmonitor or similar command-bearing configuration during routine operations. Reachability requires attacker-controlled repository content and a Git operation; execution can expose credentials, modify files, or compromise the workstation.

The record

CVE
CVE-2026-45033
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Twitter
Product
GitHub Copilot CLI
Classifications
CWE-696, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.43

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Twitter · GitHub Copilot CLIversion=< 1.0.43

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-696Incorrect Behavior Order
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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