Vulnerability-Lookup

CVE-2025-54867 (GCVE-0-2025-54867)

Vulnerability from cvelistv5 – Published: 2025-08-14 16:08 – Updated: 2025-08-14 19:26

Title

Youki Symlink Following Vulnerability

Summary

Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.

Severity

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-08-14 18:43 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/youki-dev/youki/security/advis…	x_refsource_CONFIRM
https://github.com/youki-dev/youki/commit/0d9b4f2…	x_refsource_MISC
https://github.com/youki-dev/youki/releases/tag/v0.5.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
youki-dev	youki	Affected: < 0.5.5	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-54867

Vulnerability from fkie_nvd - Published: 2025-08-14 16:15 - Updated: 2026-06-17 09:40

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37	Patch
security-advisories@github.com	https://github.com/youki-dev/youki/releases/tag/v0.5.5	Release Notes
security-advisories@github.com	https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw	Vendor Advisory

Impacted products

	Vendor	Product	Version
	youki-dev	youki	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "youki",
          "vendor": "youki-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.5.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:youki-dev:youki:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1DB306AA-E666-448F-BEEA-222E01169DED",
              "versionEndExcluding": "0.5.5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5."
    },
    {
      "lang": "es",
      "value": "Youki es un entorno de ejecuci\u00f3n de contenedores escrito en Rust. Antes de la versi\u00f3n 0.5.5, si /proc y /sys en rootfs eran enlaces simb\u00f3licos, pod\u00edan explotarse para acceder al sistema de archivos ra\u00edz del host. Este problema se ha corregido en la versi\u00f3n 0.5.5."
    }
  ],
  "id": "CVE-2025-54867",
  "lastModified": "2026-06-17T09:40:49.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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            }
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GHSA-J26P-6WX7-F3PW

Vulnerability from github – Published: 2025-08-14 16:39 – Updated: 2025-08-14 19:37

Summary

Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.

Details

Summary

If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.

Details

For security reasons, container creation should be prohibited if /proc or /sys in the rootfs is a symbolic link. I verified this behavior with youki. When /proc or /sys is a symbolic link, runc fails to create the container, whereas youki successfully creates it.

This is the fix related to this issue in runc. * https://github.com/opencontainers/runc/pull/3756 * https://github.com/opencontainers/runc/pull/3773 * https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590 * https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60

Impact

The following advisory appears to be related to this vulnerability: * https://github.com/advisories/GHSA-vpvm-3wq2-2wvm * https://github.com/advisories/GHSA-fh74-hm69-rqjw

Severity

7.0 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "youki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-54867"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-61"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-14T16:39:04Z",
    "nvd_published_at": "2025-08-14T16:15:39Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nIf `/proc` and `/sys` in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.\n\n### Details\n\nFor security reasons, container creation should be prohibited if `/proc` or `/sys` in the rootfs is a symbolic link.\nI verified this behavior with `youki`.\nWhen `/proc` or `/sys` is a symbolic link, `runc` fails to create the container, whereas `youki` successfully creates it.\n\nThis is the fix related to this issue in `runc`.\n* https://github.com/opencontainers/runc/pull/3756\n* https://github.com/opencontainers/runc/pull/3773\n* https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590\n* https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60\n\n\n### Impact\n\nThe following advisory appears to be related to this vulnerability:\n* https://github.com/advisories/GHSA-vpvm-3wq2-2wvm\n* https://github.com/advisories/GHSA-fh74-hm69-rqjw",
  "id": "GHSA-j26p-6wx7-f3pw",
  "modified": "2025-08-14T19:37:22Z",
  "published": "2025-08-14T16:39:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54867"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/youki-dev/youki"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/releases/tag/v0.5.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem."
}

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.

Action not permitted

CVE-2025-54867 (GCVE-0-2025-54867)

FKIE_CVE-2025-54867

GHSA-J26P-6WX7-F3PW

Summary

Details

Impact

Tags

Sightings

Nomenclature

Related by attack behaviour