Security readout for executives and security teams
Plain-English summary
This flaw affects Gitoxide components that process Git submodules. A malicious repository can place unsafe instructions in submodule metadata that may run commands when an application updates an already-initialized submodule. The business risk is code execution in developer tools, CI jobs, or automation that handles untrusted repositories.
Executive priority
Treat this as high priority for engineering environments that ingest third-party code. Patch affected dependencies promptly because compromise could execute commands inside build, analysis, or developer automation contexts.
Technical view
gix-submodule before 0.29.0, gitoxide before 0.5.21, and gix before 0.84.0 incompletely validate the .gitmodules update field. With partial submodule configuration in .git/config, the CommandForbiddenInModulesConfiguration guard can be bypassed, leading to command execution when Submodule::update() is invoked.
Likely exposure
Exposure is most likely in applications, developer tooling, or CI systems that use affected gitoxide, gix, or gix-submodule versions and call Submodule::update() on repositories containing previously initialized submodules, especially from external or user-controlled sources.
Exploitation context
The source bundle reports remote code execution potential but does not show confirmed active exploitation. KEV is false. Exploitation requires user or workflow interaction with a crafted repository state and a vulnerable submodule update path.
Researcher notes
The key condition is a previously initialized submodule with only partial configuration in .git/config, allowing .gitmodules update validation bypass. Do not assume general Git exposure; focus on gitoxide-based submodule update paths and affected library versions.
Mitigation direction
- Upgrade gitoxide to 0.5.21 or later where used.
- Upgrade gix to 0.84.0 or later where used.
- Upgrade gix-submodule to 0.29.0 or later where used.
- Avoid processing untrusted repositories with vulnerable submodule update workflows until upgraded.
- Review the vendor GHSA and patch commits for project-specific guidance.
Validation and detection
- Inventory Rust dependencies and lockfiles for gitoxide, gix, and gix-submodule versions.
- Identify services or CI jobs that call Submodule::update().
- Check whether those workflows process external or user-supplied repositories.
- Review repository ingestion controls for submodule handling and initialization state.
- Confirm patched versions are deployed in developer workstations and automation images.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-40034 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.3HighVector: 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
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- GHSA Advisory GHSA-f26g-jm89-4g65CVE reference, VulnCheck · vendor-advisory
- https://github.com/GitoxideLabs/gitoxide/commit/6a2e6a436f76c8bbf2487f9967413a51356667a0CVE reference, VulnCheck · patch
- https://github.com/GitoxideLabs/gitoxide/commit/dd5c18d9e526e8de462fa40aa047acd097cfa7dcCVE reference, VulnCheck · patch
- Anthropic CVD Finding ANT-2026-6SNS6KMPCVE reference, VulnCheck · third-party-advisory
- VulnCheck Advisory: gitoxide - Command Injection via Partial .gitmodules Override in gix-submoduleCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.