---
id: CVE-2026-40034
title: >-
  gix-submodule before 0.29.0 (gitoxide before 0.5.21, gix before 0.84.0)
  incorrectly validates the update field in .gitmodules, allowing attackers to
  bypass the CommandForbiddenInModulesConfiguration guard when a submodule has
  been initia…
summary: >-
  gix-submodule before 0.29.0 (gitoxide before 0.5.21, gix before 0.84.0)
  incorrectly validates the update field in .gitmodules, allowing attackers to
  bypass the CommandForbiddenInModulesConfiguration guard when a submodule has
  been initia…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-77
vendor: gitoxide
product: gitoxide
affected:
  - gitoxide < 0.5.21
  - gix-submodule < 0.29.0
  - gix < 0.84.0
patched:
  - gix 0.83.0
published: '2026-05-26'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:14.550'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40034'
references:
  - url: >-
      https://github.com/GitoxideLabs/gitoxide/commit/6a2e6a436f76c8bbf2487f9967413a51356667a0
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/GitoxideLabs/gitoxide/commit/dd5c18d9e526e8de462fa40aa047acd097cfa7dc
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-f26g-jm89-4g65
    label: disclosure@vulncheck.com
  - url: 'https://red.anthropic.com/2026/cvd/findings/ANT-2026-6SNS6KMP'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/gitoxide-command-injection-via-partial-gitmodules-override-in-gix-submodule
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-f26g-jm89-4g65
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-40034'
  - url: 'https://github.com/GitoxideLabs/gitoxide'
tags:
  - nvd
  - cve.org
  - exploit-available
  - osv
  - rust
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-05-26T15:00:27.629890Z'
epss: 0.00651
epssPercentile: 0.51002
aliases:
  - GHSA-f26g-jm89-4g65
ecosystem: rust
ingestedAt: '2026-08-07T19:14:19.522Z'
---

## Overview

gix-submodule before 0.29.0 (gitoxide before 0.5.21, gix before 0.84.0) incorrectly validates the update field in .gitmodules, allowing attackers to bypass the CommandForbiddenInModulesConfiguration guard when a submodule has been initialized with only partial configuration in .git/config. An attacker can inject arbitrary shell commands via the update field in .gitmodules that will be executed when Submodule::update() is called on a previously-initialized submodule, enabling remote code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-40034)

Affected packages:

- `gix >= 0.31.0, < 0.83.0`

Patched in:

- `gix 0.83.0`

Source: https://osv.dev/vulnerability/GHSA-f26g-jm89-4g65