Vulnerability-Lookup

CVE-2026-5223 (GCVE-0-2026-5223)

Vulnerability from cvelistv5 – Published: 2026-05-25 08:57 – Updated: 2026-05-27 18:35

Title

Crates in third party registries can override the cached source of other crates

Summary

Cargo incorrectly handled symlinks inside of crate tarballs downloaded from third-party registries, allowing a malicious crate to override the source code of another crate from the same registry. The severity of the vulnerability is **medium** for users of third-party registries. Users of crates.io are **not affected**, as crates.io forbids uploading crates containing any symlink.

Severity

6.5 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H

CWE

CWE-61 - UNIX symbolic link (symlink) following

Assigner

rust

References

3 references

URL	Tags
https://groups.google.com/g/rustlang-security-ann…	vendor-advisorymailing-list
https://blog.rust-lang.org/2026/05/25/cve-2026-5223/	vendor-advisory
https://github.com/rust-lang/cargo/pull/17031	patch

Impacted products

1 product

Vendor	Product	Version
Rust Project	Cargo	Affected: 1.0.0 , < 1.96.0 (semver)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-5223

Vulnerability from fkie_nvd - Published: 2026-05-25 10:16 - Updated: 2026-05-26 19:08

Severity

6.5 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H

Summary

References

	URL	Tags
	986d4109-89ea-491f-99fd-a8e4803919bd	https://blog.rust-lang.org/2026/05/25/cve-2026-5223/
	986d4109-89ea-491f-99fd-a8e4803919bd	https://github.com/rust-lang/cargo/pull/17031
	986d4109-89ea-491f-99fd-a8e4803919bd	https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "lang": "en",
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  "id": "CVE-2026-5223",
  "lastModified": "2026-05-26T19:08:15.080",
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}

MSRC_CVE-2026-5223

Vulnerability from csaf_microsoft - Published: 2026-05-02 00:00 - Updated: 2026-05-27 01:18

Summary

Crates in third party registries can override the cached source of other crates

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-5223

CWE-61 - UNIX Symbolic Link (Symlink) Following

Affected products

Under investigation 2 products

Product	Identifier	Version	Remediation
Unresolved product id: 17084-2		—
Unresolved product id: 17084-1		—

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

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        "title": "Additional Resources"
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        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
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    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-5223 Crates in third party registries can override the cached source of other crates - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-5223.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Crates in third party registries can override the cached source of other crates",
    "tracking": {
      "current_release_date": "2026-05-27T01:18:36.000Z",
      "generator": {
        "date": "2026-05-27T07:15:09.734Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-5223",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-27T01:18:36.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-5223",
      "cwe": {
        "id": "CWE-61",
        "name": "UNIX Symbolic Link (Symlink) Following"
      },
      "notes": [
        {
          "category": "general",
          "text": "rust",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "under_investigation": [
          "17084-2",
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-5223 Crates in third party registries can override the cached source of other crates - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-5223.json"
        }
      ],
      "title": "Crates in third party registries can override the cached source of other crates"
    }
  ]
}

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.

Action not permitted

CVE-2026-5223 (GCVE-0-2026-5223)

FKIE_CVE-2026-5223

MSRC_CVE-2026-5223

Tags

Sightings

Nomenclature