Vulnerability-Lookup

ubuntu-cve-2026-35373

Vulnerability from osv_ubuntu

Published

2026-04-22 17:16

Modified

2026-05-20 15:27

Summary

Details

A logic error in the ln utility of uutils coreutils causes the program to reject source paths containing non-UTF-8 filename bytes when using target-directory forms (e.g., ln SOURCE... DIRECTORY). While GNU ln treats filenames as raw bytes and creates the links correctly, the uutils implementation enforces UTF-8 encoding, resulting in a failure to stat the file and a non-zero exit code. In environments where automated scripts or system tasks process valid but non-UTF-8 filenames common on Unix filesystems, this divergence causes the utility to fail, leading to a local denial of service for those specific operations.

Severity

3.3 (Low)


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

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-35373	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-35373	REPORT
	https://github.com/uutils/coreutils/pull/11403	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"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.8.0-0ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.8.0-0ubuntu3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.2-0ubuntu2",
        "0.2.2-0ubuntu4",
        "0.5.0-0ubuntu1",
        "0.5.0-0ubuntu2",
        "0.6.0-0ubuntu1",
        "0.7.0-0ubuntu1",
        "0.8.0-0ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "A logic error in the ln utility of uutils coreutils causes the program to reject source paths containing non-UTF-8 filename bytes when using target-directory forms (e.g., ln SOURCE... DIRECTORY). While GNU ln treats filenames as raw bytes and creates the links correctly, the uutils implementation enforces UTF-8 encoding, resulting in a failure to stat the file and a non-zero exit code. In environments where automated scripts or system tasks process valid but non-UTF-8 filenames common on Unix filesystems, this divergence causes the utility to fail, leading to a local denial of service for those specific operations.",
  "id": "UBUNTU-CVE-2026-35373",
  "modified": "2026-05-20T15:27:25Z",
  "published": "2026-04-22T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35373"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35373"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/uutils/coreutils/pull/11403"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35373"
  ]
}

CVE-2026-35373 (GCVE-0-2026-35373)

Vulnerability from cvelistv5 – Published: 2026-04-22 16:09 – Updated: 2026-04-22 17:20

Title

uutils coreutils ln Local Denial of Service via Improper Handling of Non-UTF-8 Filenames

Summary

Severity

3.3 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 17:19 UTC

CWE

CWE-176 - Improper Handling of Unicode Encoding

Assigner

canonical mitre root

References

1 reference

URL	Tags
https://github.com/uutils/coreutils/pull/11403	patchissue-tracking

Impacted products

1 product

Vendor	Product	Version
Uutils	coreutils

Credits

Zellic

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35373",
                "options": [
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                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:19:57.514800Z",
                "version": "2.0.3"
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          "lang": "en",
          "value": "A logic error in the ln utility of uutils coreutils causes the program to reject source paths containing non-UTF-8 filename bytes when using target-directory forms (e.g., ln SOURCE... DIRECTORY). While GNU ln treats filenames as raw bytes and creates the links correctly, the uutils implementation enforces UTF-8 encoding, resulting in a failure to stat the file and a non-zero exit code. In environments where automated scripts or system tasks process valid but non-UTF-8 filenames common on Unix filesystems, this divergence causes the utility to fail, leading to a local denial of service for those specific operations."
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      "impacts": [
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      "metrics": [
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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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.