Vulnerability-Lookup

UBUNTU-CVE-2026-35356 (CVE-2026-35356)

Vulnerability from osv_ubuntu – Published: 2026-04-22 17:16 – Updated: 2026-05-14 11:40 – Source website

Details

A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the install utility of uutils coreutils when using the -D flag. The command creates parent directories and subsequently performs a second path resolution to create the target file, neither of which is anchored to a directory file descriptor. An attacker with concurrent write access can replace a path component with a symbolic link between these operations, redirecting the privileged write to an arbitrary file system location.

Severity

6.3 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-35356	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-35356	REPORT
	https://github.com/uutils/coreutils/pull/10140	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.0.24-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.0.24-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.20-1",
        "0.0.22-1",
        "0.0.23-1",
        "0.0.23-2",
        "0.0.23-3",
        "0.0.24-1",
        "0.0.24-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.2.2-0ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.2.2-0ubuntu2.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.30-1",
        "0.0.30-2",
        "0.0.30-2ubuntu2",
        "0.1.0-0ubuntu1",
        "0.1.0+git20250711.2ba3a33-0ubuntu1",
        "0.1.0+git20250711.2ba3a33-0ubuntu2",
        "0.1.0+git20250711.2ba3a33-0ubuntu3",
        "0.1.0+git20250711.2ba3a33-0ubuntu4",
        "0.1.0+git20250801.cf79675-0ubuntu1",
        "0.1.0+git20250813.4af2a84-0ubuntu2",
        "0.1.0+git20250813.4af2a84-0ubuntu4",
        "0.1.0+git20250813.4af2a84-0ubuntu6",
        "0.1.0+git20250813.4af2a84-0ubuntu7",
        "0.2.2-0ubuntu1",
        "0.2.2-0ubuntu2",
        "0.2.2-0ubuntu2.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the install utility of uutils coreutils when using the -D flag. The command creates parent directories and subsequently performs a second path resolution to create the target file, neither of which is anchored to a directory file descriptor. An attacker with concurrent write access can replace a path component with a symbolic link between these operations, redirecting the privileged write to an arbitrary file system location.",
  "id": "UBUNTU-CVE-2026-35356",
  "modified": "2026-05-14T11:40:57Z",
  "published": "2026-04-22T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35356"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35356"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/uutils/coreutils/pull/10140"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35356"
  ]
}

CVE-2026-35356 (GCVE-0-2026-35356)

Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 18:00

Title

uutils coreutils install Arbitrary File Overwrite with -D via Path Component Symlink Race

Summary

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 17:59 UTC

CWE

CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition

Assigner

canonical mitre root

References

2 references

URL	Tags
https://github.com/uutils/coreutils/pull/10140	patchissue-tracking
https://github.com/uutils/coreutils/releases/tag/0.7.0	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Uutils	coreutils	Affected: 0 , < 0.7.0 (semver)

Credits

Zellic

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
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            "other": {
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                "id": "CVE-2026-35356",
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:59:48.307644Z",
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      "metrics": [
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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UBUNTU-CVE-2026-35356 (CVE-2026-35356)

CVE-2026-35356 (GCVE-0-2026-35356)

Tags

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