Vulnerability-Lookup

UBUNTU-CVE-2026-40034 (CVE-2026-40034)

Vulnerability from osv_ubuntu – Published: 2026-05-26 15:16 – Updated: 2026-06-03 11:23 – Source website

Details

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.

Severity

7.8 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.5 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-40034	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-40034	REPORT
	https://github.com/GitoxideLabs/gitoxide/commit/6…	REPORT
	https://github.com/GitoxideLabs/gitoxide/commit/d…	REPORT
	https://github.com/GitoxideLabs/gitoxide/security…	REPORT
	https://red.anthropic.com/2026/cvd/findings/ANT-2…	REPORT
	https://www.vulncheck.com/advisories/gitoxide-com…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-gix-dev",
            "binary_version": "0.69.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-gix",
        "purl": "pkg:deb/ubuntu/rust-gix@0.69.1-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.69.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-gix-submodule-dev",
            "binary_version": "0.16.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-gix-submodule",
        "purl": "pkg:deb/ubuntu/rust-gix-submodule@0.16.0-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.16.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-gix-dev",
            "binary_version": "0.73.0-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-gix",
        "purl": "pkg:deb/ubuntu/rust-gix@0.73.0-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.69.1-1",
        "0.69.1-2",
        "0.73.0-1",
        "0.73.0-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-gix-submodule-dev",
            "binary_version": "0.20.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-gix-submodule",
        "purl": "pkg:deb/ubuntu/rust-gix-submodule@0.20.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.16.0-1",
        "0.20.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-40034",
  "modified": "2026-06-03T11:23:41Z",
  "published": "2026-05-26T15:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40034"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40034"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GitoxideLabs/gitoxide/commit/6a2e6a436f76c8bbf2487f9967413a51356667a0"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GitoxideLabs/gitoxide/commit/dd5c18d9e526e8de462fa40aa047acd097cfa7dc"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GitoxideLabs/gitoxide/security/advisories/GHSA-f26g-jm89-4g65"
    },
    {
      "type": "REPORT",
      "url": "https://red.anthropic.com/2026/cvd/findings/ANT-2026-6SNS6KMP"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/gitoxide-command-injection-via-partial-gitmodules-override-in-gix-submodule"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40034"
  ]
}

CVE-2026-40034 (GCVE-0-2026-40034)

Vulnerability from cvelistv5 – Published: 2026-05-26 14:08 – Updated: 2026-07-14 20:00

Title

gitoxide - Command Injection via Partial .gitmodules Override in gix-submodule

Summary

Severity

7.3 (High)


                        
                          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

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-26 15:00 UTC

CWE

CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/GitoxideLabs/gitoxide/security…	vendor-advisory
https://github.com/GitoxideLabs/gitoxide/commit/6…	patch
https://github.com/GitoxideLabs/gitoxide/commit/d…	patch
https://red.anthropic.com/2026/cvd/findings/ANT-2…	third-party-advisory
https://www.vulncheck.com/advisories/gitoxide-com…	third-party-advisory

Impacted products

3 products

Vendor	Product	Version
gitoxide	gitoxide	Affected: 0 , < 0.5.21 (semver) Unaffected: 0.5.21 (semver)
gitoxide	gix-submodule	Affected: 0 , < 0.29.0 (semver) Unaffected: 0.29.0 (semver)
gitoxide	gix	Affected: 0 , < 0.84.0 (semver) Unaffected: 0.84.0 (semver)

Date Public

2026-04-25 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.