Vulnerability-Lookup

FKIE_CVE-2026-5223

Vulnerability from fkie_nvd - Published: 2026-05-25 10:16 - Updated: 2026-07-23 17:10

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

References

URL	Tags
986d4109-89ea-491f-99fd-a8e4803919bd	https://blog.rust-lang.org/2026/05/25/cve-2026-5223/	Mitigation, Vendor Advisory
986d4109-89ea-491f-99fd-a8e4803919bd	https://github.com/rust-lang/cargo/pull/17031	Issue Tracking, Patch
986d4109-89ea-491f-99fd-a8e4803919bd	https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8	Mailing List, Third Party Advisory

Impacted products

	Vendor	Product	Version
	rust-lang	cargo	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://crates.io",
          "defaultStatus": "unaffected",
          "packageName": "cargo",
          "product": "Cargo",
          "repo": "https://github.com/rust-lang/cargo",
          "vendor": "Rust Project",
          "versions": [
            {
              "lessThan": "1.96.0",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "986d4109-89ea-491f-99fd-a8e4803919bd"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rust-lang:cargo:*:*:*:*:*:rust:*:*",
              "matchCriteriaId": "67F6F381-6055-48F2-A156-047F903ABE84",
              "versionEndExcluding": "1.96.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\u00a0The 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."
    },
    {
      "lang": "es",
      "value": "Cargo gestion\u00f3 incorrectamente los enlaces simb\u00f3licos dentro de los tarballs de crates descargados de registros de terceros, permitiendo que un crate malicioso sobrescribiera el c\u00f3digo fuente de otro crate del mismo registro. La gravedad de la vulnerabilidad es media para los usuarios de registros de terceros. Los usuarios de crates.io no se ven afectados, ya que crates.io proh\u00edbe subir crates que contengan enlaces simb\u00f3licos."
    }
  ],
  "id": "CVE-2026-5223",
  "lastModified": "2026-07-23T17:10:00.123",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "986d4109-89ea-491f-99fd-a8e4803919bd",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-5223",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-26T14:36:37.949868Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-25T10:16:15.480",
  "references": [
    {
      "source": "986d4109-89ea-491f-99fd-a8e4803919bd",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://blog.rust-lang.org/2026/05/25/cve-2026-5223/"
    },
    {
      "source": "986d4109-89ea-491f-99fd-a8e4803919bd",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/rust-lang/cargo/pull/17031"
    },
    {
      "source": "986d4109-89ea-491f-99fd-a8e4803919bd",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8"
    }
  ],
  "sourceIdentifier": "986d4109-89ea-491f-99fd-a8e4803919bd",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-61"
        }
      ],
      "source": "986d4109-89ea-491f-99fd-a8e4803919bd",
      "type": "Secondary"
    }
  ]
}

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

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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-26 14:36 UTC

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

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5223",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-26T14:36:37.949868Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-27T18:35:35.093Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://crates.io",
          "defaultStatus": "unaffected",
          "packageName": "cargo",
          "product": "Cargo",
          "repo": "https://github.com/rust-lang/cargo",
          "vendor": "Rust Project",
          "versions": [
            {
              "lessThan": "1.96.0",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "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.\u0026nbsp;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."
            }
          ],
          "value": "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.\u00a0The 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."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-141",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-141 Cache Poisoning"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-61",
              "description": "CWE-61 UNIX symbolic link (symlink) following",
              "lang": "en",
              "type": "CWE"
            }
          ]
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        "dateUpdated": "2026-05-25T08:57:08.488Z",
        "orgId": "986d4109-89ea-491f-99fd-a8e4803919bd",
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          "url": "https://blog.rust-lang.org/2026/05/25/cve-2026-5223/"
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          "url": "https://github.com/rust-lang/cargo/pull/17031"
        }
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      "solutions": [
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          "supportingMedia": [
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              "type": "text/html",
              "value": "Rust 1.96.0, to be released on May 28th, 2026, will update Cargo to \nreject extracting *any* symlink within crate tarballs, regardless of \nwhether they come from crates.io (which already forbids them) or \nthird-party registries. Note that Cargo never added symlinks when \nrunning `cargo package` or `cargo publish`, so the impact of this should be\n minimal."
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        }
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              "value": "Users who are not able to upgrade to the most recent Rust version are recommended to audit the contents of their registry for the presence of any symlink, and to configure their registry to reject symlink (if such option is available).\u003cbr\u003e"
            }
          ],
          "value": "Users who are not able to upgrade to the most recent Rust version are recommended to audit the contents of their registry for the presence of any symlink, and to configure their registry to reject symlink (if such option is available)."
        }
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    "datePublished": "2026-05-25T08:57:08.488Z",
    "dateReserved": "2026-03-31T12:07:41.420Z",
    "dateUpdated": "2026-05-27T18:35:35.093Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-5223

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

Tags

Sightings

Nomenclature