Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email

published 2025-09-10 13 mo ago modified 2026-06-17 4 mo ago also GHSA-j4h9-wv2m-wrf7 , EUVD-2025-27563

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits: 0; none known

Claude Code is an agentic coding tool. At startup, Claude Code executed a command templated in with `git config user.email`. Prior to version 1.0.105, a maliciously configured user email in git could be used to trigger arbitrary code execution before a user accepted the workspace trust dialog. Users on standard Claude Code auto-update will have received this fix automatically. Users performing manual updates are advised to update to version 1.0.105 or the latest version.

Patch / fix

fixed in 2

npm @anthropic-ai/claude-code 1.0.105
anthropic claude_code 1.0.105

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 12 mo ago (2025-10-15)

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@anthropic-ai/claude-code	<1.0.105	1.0.105

Affected products

anthropics claude-code

Classification

Weakness

CWE-94 Improper Control of Generation of Code
CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

github.com /anthropics/claude-code/security/advisories/GHSA-j4h9-wv2m-wrf7
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2025-59041
advisory
github.com /anthropics/claude-code
package
npmjs.com /package/@anthropic-ai/claude-code/v/1.0.105
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary